Quad : Our quad skates feature lace lock closure system and glass reinforced nylon Zytel frame. Breathable liner with memory foam and shock-absorbing insole. Size : 2-13 Boot : Outside-PVC leather Inside-split leather Chassis : Du-pont Zytel 8018, black Trucks : Alum.material Bearings : Abec-1 608ZZ Wheels : 58 x 32mm casting Pu, black Stopper : Rubber, back