... , Rubber, Super artificial rubber. Size:v2' -5inche Caster is important compoent of Wei Tao-line flow pipe system ... worktables, carts,racks.There is caster iron rubber wheel ,super artificial rubber wheel ,PPwheel,phenolicaldehyde wheel ,ESD wheel,with elastic ,low noise ... when move it. It's divide two style:With brake &Without brake worktable PU 3' wheel caster ...