... . Wheel material : PU,High-elastic,Anti-friction3. Wheel flashes with multicolour lights -no motor or batteries require4. Bearing material :ABEC ... Wheel material : PU,High-elastic,Anti-friction 3. Wheel flashes with multicolour lights -no motor or batteries required 4. Bearing material ... 30.40kgs,G.W.:37.50kgsQty/ctnr: 12000/20Fflashing roller,flash roller,flashing roller skate flash light roller shoes