Sizes: 500 x 500 x 45mm, 500 x 500 x 5mm, 500 x 500 x 20mm, 300 x 300 x 1mm Features:1) Colors available: black, grey, green, rust-red, colorful2) Used for indoor floor, such as indoor playground, hospital, dinning room, usedfor outdoor floor, such as raceway, playground, sideway.