... caster 2.Wheel diameter: 75mm,100mm, 125mm3.Caster material: Thermoplastic rubber with precision ball bearing ,pressed steel,zinc plated,double ballrace ... . Our wheel diameter is from 15mm to 300mm, materials include rubber, TPR, PU, plastic, nylon, cast iron, pneumatic, phenolic and ... , and the popular type. Casters are more than 50 series, 1000 types for customers’ choices and wide different usage, ...