... :EF-ZB02/ EF-ZB03 Material:Nylon,PU, Rubber, Super artificial rubber. Size:v2' -5inche Caster is important compoent of Wei Tao-line flow ... commonly used in worktables, carts,racks.There is caster iron rubber wheel ,super artificial rubber wheel ,PPwheel,phenolicaldehyde wheel ,ESD wheel,with elastic ... two style:With brake &Without brake worktable PU 3' wheel caster