1,Fit for all types of office chairs 2,caster wheel Meet BIFMA Standard 3,Performance on carpet or hard floors caster wheelItem NO: HYL-021,Color: Gray ,Black or White2,Material: PU3,Pin size:11x22mm4,Wheel Diameter:50mm5,Packing: 200 pcs / carton6,Packing size:52x31x28cm7,Specification:Pass BIFMA Standard Test 100,000 times.This chair caster performance on carpet or floorsFunction:Fit for all ...