Roll Smoother. Protect Your Floors. Upgrade Your Chair. Built for Better Movement Oversized 3" rollerblade-style wheels glide easier than standard office chair castersSmooth rolling design reduces resistance on carpet and hard floorsDual ball bearings help deliver quiet, effortless movement Safe for Nearly Any Floor Designed for hardwood, tile, laminate, vinyl, and carpetSoft polyurethane wheels help reduce scratches and scuffsNo chair mat required for everyday use Heavy-Duty Construction Polyurethane and steel construction built for long-term durabilitySupports up to 550 lbs combined wheel capacity360° swivel design for unrestricted movement in any direction Quick & Easy Installation Universal 7/16" stem fits most office chairsTool-free installation in just minutesDirect replacement for standard office chair wheels What's Included 5 × CDC Rollerblade Caster WheelsPre-installed 7/16" stemsReady for installation right out of the box