chair caster,caster,chair leg casters,PA PU caster 1.Material:PU, PA+PU, PA 2.Test: passBIFMA 3. ... Size:45mm,50mm,60mm,65mm,70mm chair caster,caster,chair leg casters,PA PU caster1.Material:PU, PA+PU ... .Fuction:Brake9.Working temperature:-30°~normal10:Parking:5pcs/se chair caster