Package Dimensions ‏ : ‎ 7.9 x 5.04 x 3.03 inches; 1.21 Pounds Item model number ‏ : ‎ MaxGear-2in PU Leather Wheel-WHE-10 PACK Compression Brake Casters automatically lock the wheels as soon as weight is applied to the office chair. It only takes as little as 12-15 lbs of weight for the compression casters to lock. Self Braking Casters utilize a special friction brake that automatically engages and locks the wheel as soon as weight is applied to the chair. These types of chair casters are a requirement for safety standards within many industries including, retirement homes, nursing homes, hospitals, surgery centers, physical therapy centers, rehabilitation centers, and even corporate offices where the office chairs need to remain in one location when being utilized. When the person is not sitting on the chair, it is very easy for the chair to be maneuvered around. As soon as weight is applied, the chair will remain in its place. Product Description A perfect set of 10, replacement, 2" caster wheels for your office chair. These wheels use a standard 7/16-inch sizing stem that simply snaps in where the old one snaps out, making them ideal as a full replacement set and suitable for almost all office chairs taking only minutes for replacement time. These quiet rolling castor wheels swivel a full 360 degrees easily and smoothly without clunky hang-ups or stuck wheels. Comes with 5 total wheels, 2" diameter twin wheel design - the standard for most office chairs. The flat black finish blends flawlessly with almost any type of chair or decor. Perfect for home office, office, with or without chair mats. From the Manufacturer They also work on all types of other moving furniture like bakers rack, nightstand, cabinets and others that accept a 7/16" stem size. Backed by our 5-year limited warranty