... 2.Wheel diameter: 75mm,100mm, 125mm3.Caster material: Hard rubber with delrin bearing,pressed steel,zinc plated,double ballrace swivel ... market, etc. 8.Caster with or without brake available 9.Assorted colors (optional)10. Complies with international quality standard: ISO 9001 ... . Our wheel diameter is from 15mm to 300mm, materials include rubber, TPR, PU, plastic, nylon, cast iron, pneumatic, phenolic ...