... steel2. Wheel material : PU,High-elastic,Anti-friction3. Wheel flashes with multicolour lights -no motor or batteries require4. Bearing material :ABEC ... use FOB price,if customer have any other request can talk with us.7.We can help customer to design a package ... Wheel material : PU,High-elastic,Anti-friction 3. Wheel flashes with multicolour lights -no motor or batteries required 4. Bearing material ...