Product name: worktable caster Style No:EF-ZB02/ EF-ZB03 Material:Nylon,PU, Rubber, Super artificial rubber. Size:v2' -5inche Caster is important compoent of ... 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