PP wheel: 1. 3" 4" 5" 6" .. 2. plastic nylon 3.quickly delivery time 4.best service PP Wheel SizeDiameter 5mmwidth 32mmHub length 40mm Color black Bore size 10mm Material solid PP , NYLON Tempreture range -20 to 180 The economical choice for lightweight, easy rolling, and nonmarking wheels. Wheels resist water, oil, solvents, and many chemicals