... diameter: 75mm,100mm, 125mm3.Caster material: Thermoplastic rubber with precision ball bearing ,pressed steel,zinc plated,double ballrace swivel ... double brake ,threaded stem and solid stem 6.Hard rubber,Plastic and Polyurethane are available 7.Complies with international quality ... Our wheel diameter is from 15mm to 300mm, materials include rubber, TPR, PU, plastic, nylon, cast iron, pneumatic, ...