Why you need them? Are you tired of always hearing that annoying squeaky sound coming from your office chair? have problems with the of flexibility of your chair wheels because they always get stuck ? Are you searching for a way to protect your hardwood floors from your chair? Then , the new and improved chair wheels. Not only are the wheels offering more flexibility to move around your office, no matter the surface, but will protect your hardwood floors from any scratching or extra pressure, allowing you to move freely while taking care of your premium floors, transform your dull chair into a beautiful, modern piece of furniture. Features - - Material: PU. - Size: 8.00 x 7.00 x 3.00cm/ 3.14 x 2.75 x 1.18 inch. - Will not damage any kinds of floor, caster wheel with material. - To protect your floors from scratching and getting marks on the surface. - The whole support bracket and internal parts are made of high grade material that is able to safely support. - Brings life long smoothly rolling and durability, easy to change direction as you want and the metal frame never bend as others. - You can use it to replace old casters simply and effortlessly. Perfect for home, office, etc. Package list: 4 x casters