1. Round shape, four color to choose:black, white, red, blue, POM material, very hard, wear resistant. 2. Around of the edge, there are eight 13mm*9mm flintstones, so when it the rub ground, it will come out flames. It is so cool and make you so special in night. 3. In the middle of this puck, theire is a hexagonal hole, you can use it to unscrew the nuts nails. 4. The diameter of this puck is 85mm, and the thickness of this puck is 12mm. 5. The back of this puck is velcro, so it is very easy to any longboard gloves also with the velco.