Features: Upgrade your office chair with these smooth, quiet and durable casters. Our casters work on all floors and 't scratch or leave marks on any surface, including hardwood, carpet, tile, laminate, vinyl and more Easy to install: no tools required. Simply pull out the old caster and push in the new wheel until the caster is firmly seated and secure The new nylon locking chair casters are wear-resistant and not prone to corrosion. Office chair wheels are heavy-duty design, with a maximum load capacity of 1,000 pounds, set of 5 Standard office chair casters measure 7 or 16 in x 7 or 8 in (11 mm x 22 mm). Chair slides are suitable for different swivel chairs (executive chairs, office chairs, gaming chairs, desk chairs) and are perfect to roll your stool or office chair into a more stable fixed position color: Black Material: Nylon Package Contents: 5 x casters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.