High Quality Material Made of premium solid black nylon material, thickening and durable, the bearing is strong enough, can be an economic chair wheels replacement. And used O ring between main chair glide body and the metal stem ,can reduce the impact from the weight and make sure silent when the glides are used. 5 Pcs Office Chair Glides With the base's diameter is 50mm and 11mm * 22mm Stem to attach to most standard chair or stool bases. Suitable size can meet your needs. Except the chair which use 10mm Stem Caster.With heavy duty weight rated 88.2 lbs/40KGof each casters.Totally 5 casters as a set to supports 441 lbs/200 KG. Anti-Abrasion Felt Pad The Chair Protect Glide comes with 5 pcs anti-abrasion felt pad, which designed with smooth bottom for tile, carpet and other durable floors. If you used for wood, laminate and other softer floor types, our felt pad will be a great protector for your floors. Easy to Use Easy to install without tools. Great for converting your rolling stool or office chair to a more stable glide style, or replacing your old, worn glides. Turn a rolling chair or stool with casters into a stationary with these glides without affecting the overall chair height much. Perfect for Business Office Perfect for home or business offices, durable and reliable for many years of use. For many commercial offices that use carpet tiles, polished concrete, or vinyl tiles on their floors, a safer alternative to casters is a must