Size 3 inch plug 11*22Material PolyurethaneUnits 5.0 countsAbout this project[Universal and Premium] Designed for universal compatibility - a drop-in replacement solution for almost all rolling chairs with standard bars. Made with and premium components - heavy duty powder coated carbon steel brackets, precision shielded ball bearings, abrasion resistant polyurethane casters.[QUIET AND SMOOTH] Designed to every detail and manufactured to tight tolerances. Designed for a borderless and gap-free rolling experience - for a smooth, quiet and scratch-free sliding experience on all types of floors, without the need for a seat pad. 3" resilient polyurethane casters provide greater surface contact for enhanced comfort and quietness without sacrificing maneuverability and durability. Our caster system supports up to 650 lbs.[ANYTIME, ANYWHERE] With a rubber-like touch, it can rock freely on any surface, even in the quietest of moments. No desk mat required, perfect for office co-working spaces, professional gaming environments, or even around sleeping babies in the home office. These roller skate wheels are a great replacement for office chair wheel replacement parts, as well as upgrading office accessories and home office supplies.[Investment & Protection] Extend your daily reach with minimal investment and effort, protecting everything around you, not just your hardwood floors, but the people you care about. Just retrofit that squeaky, noisy poor chair with our system for total silence while wandering freely.