... .Wheel diameter: 200mm 4.Caster material: Plain bearing PU on nylon wheel and only NYLON is availableand . Double ... make,the caster swivel smoothly under big load,PU coated brake pedal protect shoes well.5.Chrome, ... is from 15mm to 300mm, materials include rubber, TPR, PU, plastic, nylon, cast iron, pneumatic, phenolic and sandwich ... !3.Similar Product:4.Factory: 32 PU on nylon push cart caster wheels