Salamander Designs Set of 4 Saturn Wheels for AV Cabinets (Satin Black)Saturn Wheels are shapely but strong aluminum casters that allow you to move a Synergy unit easily whenever the need arises. They lock securely when your furniture is in place. Salamander Designs Saturn Wheels Features: Aluminum casters with non marring rubber ring to protect floors. Front wheels lock securely when your furniture is in place. Adds 3" to height of cabinet.