1. Round shape, black color, POM material, very hard, wear resistant. 2. In the middle of this puck, there are five 13mm*10mm flintstones. 3. When the flintstones rub ground, it will come out flames. It is so cool and make you so special in night. 4. The diameter of this puck is 80mm, and the thickness of this puck is 16mm. 5. The back of this puck is velcro, so it is very easy to any longboard gloves also with the velco.