Wheel Size : diameter : 30/40/50MM Material : Nylon Color : Black, grey, ... ; 40*40mmBrake: Nylon brake,without brakeFinish: Zinc-platedType: swivelFeatures:1.caster: swivel caster2.Nylon: anti-abrasion, rolling resistance,etc.3.finish ... bruise and corrosion4.brake:Nylon brake,without brake5.suitable scope: furniture,official dest,etc. Twin wheel nylon castor plate type