Instant 5-Piece Backyard & Practice Diamond.
Turn any lawn, dirt field, driveway, or gym floor into a complete baseball, softball, Wiffle ball, or kickball diamond in.
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Why thousands of parents, grandparents, and youth coaches replaced flimsy vinyl mats with the Cosari DiamondFlex 5-piece set.
No missing pieces. You get three 12" × 12" rounded-corner square bases, a 16.3" × 16" pentagonal home plate, and a 16.3" × 4" rectangular pitcher's strip.
Rolls down into a compact 4.5-inch bundle that drops straight into a standard 5-gallon baseball bucket or equipment backpack—and unrolls dead flat every time.
No sharp steel spikes to hammer into dry dirt, bend on rocks, puncture irrigation pipes, or catch a runner's ankle during backyard kickball.
Molded from UV-stable, waterproof matte white rubber with embossed border lines that won't crack in cold weather, curl in hot sun, or rot in sprinkler water.
Cheap big-box bases are made from stiff recycled PVC that develops permanent creases and tripping edges. Cosari's flexible vulcanized rubber rolls up tightly for transport and relaxes flat against the ground in seconds.
Every piece features smoothly radiused safety corners and a low-profile footprint that hugs grass, infield clay, or hardwood without metal spikes—eliminating ankle-rolling ledges for kids and grandkids.
A micro-pebbled matte finish paired with subtle embossed perimeter border channels channels away morning dew and gives youth cleats, sneakers, and bare feet confident, non-slip traction on every pivot.
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Complete 5-Piece Vulcanized Matte Rubber Diamond (3 Bases + Home Plate + Pitcher's Strip) — Stake-Free, Tear-Proof & Bucket-Ready
Backed by our 30-Day Money-Back Trial & Full Cosari Guarantee.
$49.99 $99.99 Free Tracked Shipping (5–7 Days) Included
In Stock: Delivers in 5–7 Business Days. Free insured US delivery with tracking.
30-Day Money-Back Guarantee plus a full 2-Year Warranty.
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Overview & Why We Built It: Backyard baseball and youth practices shouldn't rely on soggy cardboard boxes, frisbees, or cheap vinyl sheets that curl into toe-catching trip hazards. The Cosari DiamondFlex 5-Piece Throw-Down Base Set gives families and coaches a complete, high-contrast matte-white diamond that sets up anywhere in 45 seconds and survives years of heavy foot traffic.
Materials & Dimensions: Molded from 100% weather-proof, memory-neutral vulcanized TPE/rubber in matte chalk white with embossed border perimeter lines. Includes three 12" × 12" rounded-corner square bases (1st, 2nd, 3rd), one 16.3" × 16" five-sided home plate, and one 16.3" × 4" rectangular pitcher's strip.
30-Day Money-Back Guarantee & 2-Year Warranty: Every Cosari DiamondFlex set ships fast with Free Tracked Shipping and is protected by our 30-Day Sandlot & Practice Money-Back Guarantee plus a 2-Year No-Crack Replacement Warranty.
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Precision-molded perimeter lines and smooth radiused corners prevent edge curling and reduce toe-snagging trips during fast base running.
Dense enough to resist molded youth cleats during infield drills, yet soft and flush enough for barefoot neighborhood kickball and Wiffle ball.
All 5 pieces stack flat to less than half an inch or roll into a 4.5-inch cylinder that fits inside any standard coaching bucket or bat bag.
Cosari DiamondFlex 5-Piece Throw-Down Base SetStandard Competitors
| Feature | Cosari DiamondFlex 5-Piece Throw-Down Base Set | Standard Competitors |
|---|---|---|
| Included Diamond Pieces | All 5 Pieces (3 Bases + Home Plate + Pitcher's Strip) | Often only 3 square bases (missing Home or Pitcher's rubber) |
| Material & Edge Memory | Dense Vulcanized Rubber — Lays Dead Flat | Thin PVC Vinyl — Curls into tripping hazards |
| Lawn & Sprinkler Safety | 100% Stake-Free — Zero Turf or Pipe Damage | Sharp metal spikes that bend and ruin lawns |
| Cleat & Weather Durability | 180° Tear-Proof Flex + Waterproof & UV-Stable | Cracks under cleats or absorbs water & mildews |
| Setup & Bucket Portability | 45-Second Toss-Down / Rolls into 5-Gal Bucket | Heavy 25 lb bags or tangled nylon straps |
Swipe left for steps 2 and 3
Grab all 5 rolled matte-white rubber pieces out of your 5-gallon baseball bucket, trunk, or equipment tote.
Drop home plate, pace off your pitcher's strip and 1st, 2nd, and 3rd base—every piece unrolls and lays flat with zero stakes.
Run the bases all afternoon on grass, dirt, or pavement, then roll them right back up in 30 seconds when the game is over.
Baseball means so much to my four kids, and having these at home has made them want to play in the yard even more. Three rough boys and a toddler have put them through plenty, and we haven't had any damage.
I bought this for my grandson for his 14th Birthday this month he will also be 2 year cancer free, he loves baseball and this was one thing he wanted.
My son and his friends use these for kickball and baseball in the backyard. They've been very durable so far, and the quality is really nice.
My grandson uses these when he plays wiffle ball, and they've held up really well. I was impressed with the quality for the price.
These are really nice for the price and have been durable with my five kiddos playing on them. The kids love having their own bases.
Perfect bases for playing in the backyard. Easy to toss down when the kids want a game, and the price was reasonable too.
Very nice quality, and the grandkids were thrilled when we brought these out! They've been having a lot of fun playing together.
The kids use these for kickball games in the yard. They're easy to put down and make it simple to get everyone playing.
Our boys run over these pretty hard in the yard, and we haven't had any damage. The three square bases, home plate, and pitcher's strip make it easy to set up a quick diamond.
The flexible rubber rolls up into my coaching bag and lays flat when I put it down on grass or dirt. No stakes or anchors to keep track of.
$49.99 $99.99 Free Tracked Shipping (5–7 Days) Included
In Stock – Free 5–7 Day US Shipping · 30-Day Risk-Free Trial.
Yes. Every Cosari DiamondFlex set includes all 5 pieces needed for a complete diamond: three rounded-corner square bases (1st, 2nd, and 3rd base), one five-sided pentagonal home plate, and one rectangular pitcher's strip.
No. They are 100% hardware-free and stake-free. The high-density vulcanized rubber lays flat under its own weight on grass, dirt, pavement, or gym floors—protecting your lawn, buried sprinkler lines, and kids' ankles.
No. Unlike cheap PVC plastic bases that hold permanent memory curls, our flexible vulcanized rubber compound is memory-neutral. Even after being rolled tightly inside a 5-gallon bucket, all five pieces unroll and lay flat in under 30 seconds.
Absolutely. The dense matte rubber is engineered to withstand youth cleats, turf shoes, sneakers, and bare feet without cracking, splitting, or puncturing.
They are ideal for backyard Wiffle ball, kickball, baseball, fastpitch/slowpitch softball, tee-ball, and PE drills across backyard grass, dirt infields, asphalt driveways, and indoor gym floors.
Simply spray them off with a garden hose in 10 seconds and stack or roll them away—they are 100% waterproof and UV-resistant. Every order is backed by our 30-Day Sandlot & Practice Money-Back Guarantee plus a 2-Year No-Crack Warranty.