Our 3-inch office chair wheels are made of high-quality PU and high-grade Metal, ensuring smooth, quiet rolling and superior durability. Designed to fit 98% of standard pole (7/16inch x 7/8inch) office chairs. Experience smooth, noise-free rolling with precision ball bearings on the caster swivel and shaft. Glide easily and quietly with our high-quality cushioned rubber casters. Work or play quietly without disturbing anyone around you. PROTECT YOUR FLOORING: Our replacement office chair wheels are designed to protect hardwood, laminate, tile, and all other hard floors from any potential damage. Enjoy carefree gliding on a variety of surfaces and never worry about scratches or marks again. Quick installation: Say goodbye to complicated setup! Our 3-inch office chair wheels are super easy to install - no tools required. Easily remove the old casters from the chair and insert the new casters securely to a secure fit. Enjoy worry-free upgrades! Colour:black Material:Metal+PU Size:Insert rod: 11 x 22mm, wheel diameter: about 76mm Package Contents: 5 x Office Chair Wheels Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.