Our 3-inch office chair wheels are made of fantastic PU and high-grade Metal, ensuring smooth, quiet rolling and advanced durability. Designed to slot 98% of regular pole (7/16inch x 7/8inch) workplace chairs.Experience smooth, noise-free rolling with precision ball bearings on the caster swivel and shaft. Glide easily and quietly with our positive cushioned rubber casters. Work or play quietly with out demanding anybody round you.PROTECT YOUR FLOORING: Our replacement office chair wheels are designed to protect hardwood, laminate, tile, slate and all different difficult flooring from any potential damage. Enjoy carefree gliding on a wide range of surfaces and not fear about scratches or marks again.Quick installation: Say see you later to confusing setup! Our 3-inch workplace chair wheels are tremendous clean to put in - no instruments required. Easily remove the outdated casters from the chair and insert the recent casters securely to guarantee a secure fit. Enjoy worry-free upgrades!Colour:blackMaterial:Metal+PUSize:Insert rod: 11 x 22mm, wheel diameter: about 76mmPackage Contents:5 x Office Chair WheelsOnly the above kit content, other merchandise aren't included.Note: Light reflection and various reveals may cause the colour of the item in the photo a bit of varied from the genuine thing. The measurement allowed error is +/- 1-3cm.