THE LAST OFFICE CHAIR WHEELS YOU'LL NEED - Not all caster wheels are created equal. Our set of 5 heavy-duty chair wheels are made from industrial-grade steel, precision ball bearings and extremely durable polyurethane. They can support loads of up 650 lbs. YOU WILL NOT BE NEEDING A DESK CHAIR MAT ANYMORE - Our desk chair wheels replacement will NEVER scratch, smudge or damage your floors. Enjoy a carefree, safe glide across wood, hardwood, laminate, vinyl, tile and carpet floors all day long. SMOOTH GLIDING WITHOUT A SOUND - A squeaky, rickety office chair wheel is a telltale sign that they're cheap and poorly made. You'll slide and glide around in total silence with our swivel casters. THEY ARE REALLY EASY TO INSTALL. - You will be done in no time. Just pull out the original wheels and pop these in. THESE WORK WITH ALMOST EVERY NEW STYLE OFFICE AND DESK CHAIRS - The wheels are 3 in. Dia and the stem is 11 mm Dia (Won't work for IKEA chairs). Color: Black. Material: Plastic.