1. FIT IKEA CHAIRS ONLY Our office chair wheels are designed with 10mm Stem rods 3/8' X 7/8'(10mm22mm), perfect for IKEA office chairs, desk chairs, computer chairs and gaming chairs. Upgrade design allows for easy swiveling and smooth rolling. 2. STOP DAMAGING YOUR FLOORS on any hard surface. Our premium soft rubber replacement chair wheels are a great substitute for chair mats. They a perfect combination of softness, protection, and grip. With an extrathick polyurethane layer, they won't scratch, dent or leave marks on wood floors, laminate, ceramic, terracotta floors and carpet. 3. STURDY HEAVY DUTY STRUCTURE Caster wheels have a 100 percent heavyduty construction. Heavyduty solid steel stem and frame, and sturdy dual bearings that can withstand loads up to 650 lbs for all 5 office chair casters. Designed for longterm use with all types of office chairs and furniture. 4. SMOOTH QUIET ROLLING Double precision bearings and a wheel shell made of soft and shockabsorbing polyurethane ensure that these wheels roll quickly and quietly on any surface without noise, solving the problem of traditional chair wheels getting entangled with carpet or hair on floors and protecting your expensive floors in perfect condition.