Feature: 1. Precision ball bearings in the caster swivel and axel provide smooth and easy rolling. The caster chair wheels internal bearing are quick rolling and the surface is sleek,wouldn't get stuck by crumbs,hair and grit,you would enjoy smooth and silent move. 2. Encased with endless durability and high shock absorption. These replacement casters can give you smooth and quiet rolling without causing any squeaky sounds, and guaranteed not to scratch or leave marks on any surface. 3. The swivel dual lock caster kit is definitly the perfect solution for easily positioning your steel stand to any desired areas. Double lock mechanism locks both the wheel and the swivel bearing at the same time, and does not slip away at all, which is very important for your safety. 4. The stem casters are widely used for a multitude of applications. Such as light equipment, flight cases,display /exhibition equipment, shopping carts, hand trolley, movable furniture including dressers, crates, chairs, under bed storage, shoe bins, toy bins, cabinets,stands,dollies etc. Description: Name: PVC caster Weight: 283g Size: φ75mm*97mm Color: blue Material: PVC Package List: Choice 1: 4pcs x Universal casters Choice 2: 2pcs x Universal casters 2pcs x Brake casters Choice 3: 4pcs x Brake casters