Amazon.com: RevTime Easy-DIY Ultra Thick Interlocking Outdoor Rubber Tiles 20" x 20" x 1 3/4”, 45mm Thick for Playground, Outdoor Gym Floor, Sports Deck, Backyard Play Area (Pack of 2) Red :
Rubber-Cal "Eco-Sport" Interlocking Tiles - 3/4 x 19.5 x 19.5 Inch - 25 Pack - 66 Square Feet Coverage - Black - Walmart.com