... with the plastic base, which is more comfortable. back easy-adjusting system, very convenient in size changing. Material thicken sanwich mesh vamp ... part, aluminum chassisWheelsPU casted, 64x24mm, 70x24mm, 76x24mmBearingABEC-7SizeS: #30-33, M: #34-37, #L: #38-41ColorPink, Red, Yellow, BluePackagingColor box ( function ...