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, PA2.Test:BIFMA3.Size:45mm,50mm,60mm,65mm,70mm4.Color:As customer choose5.Fixed stem:Card spring,screw6.Compression test:25~30kg/pcs7.Rotation test:100000 times8.Fuction:Brake9.Working temperature:-30°~ ...