Office Chair Caster Wheels (Set of 5) - Heavy Duty & Safe for All Floors Including Hardwood - Perfect Replacement for Desk Floor Mat - Rollerblade Style w/Universal Fit SAFE FOR ALL FLOORS - Stop damaging your expensive hard wood floors. Many chair wheels use cheap, low quality materials that destroy your flooring. We don't. Encased with soft, polyurethane material our rollerblade style wheels are guaranteed not to scratch or leave marks on any surface. So feel free to finally toss that old computer chair floor mat! CASTERS YOU CAN KEEP FOR LIFE - Entire support bracket and internal parts are made of high grade steel, providing years effortless rolling and durability. The heavy duty design supports up to 650 lbs as a set of 5, the STRONGEST chair wheels on Amazon. ENJOY SMOOTH & QUIET ROLLING - Remain focused and relaxed with the help of these caster wheels. Precision ball bearings in the caster swivel and axel provide smooth, easy rolling while causing no squeaky sounds or noise of any kind. MODERN. UNIQUE. STYLISH. - These casters are designed with the universal standard size stem, so you can transform any task chairs or stools that roll into modern, striking furniture. These wheels have been regarded as the absolute best upgrades to Herman Miller Aeron, Hon, and countless other brands. 110% MONEY-BACK GUARANTEE - If these are not your favorite chair wheels you have ever owned, the smoothest and most quiet, return them for a full refund plus an extra 10%. No questions asked, just a prompt and courteous refund with a few extra dollars in your pocket.