... plastic,chrome-plate steel2. Wheel material : PU,High-elastic,Anti-friction3. Wheel flashes with multicolour lights -no motor or batteries require4. Bearing material ... ,chrome-plate steel 2. Wheel material : PU,High-elastic,Anti-friction 3. Wheel flashes with multicolour lights -no motor or batteries required 4 ... roller,flash roller,flashing roller skate flashing roller skate/flashing wheel