... / PP / PU / Rubber / NylonZinc plated, Chrome platedBall bearing , double ball bearing , bushing , delrin bearing , plain bearingFeatures:1. Easy to use 2. Rotary Flexibility3 ... Floor protection resistance5. Anti-friction, good impact resistance, high load bearing. 6. Material: High quality cold-rolled steel plate.7. ... not hesitate to contact with us. . Top plate rubber ball swivel caster wheel