Exotic Nutrition’s Silent Runner Wheel 12″” is the most innovative wheel on the market for its safety features and whisper-silent spin. The axle-free construction eliminates a dangerous center axle, reducing the risk of fur/tail entanglement, pet wrap-a-round, curvature of the spine, and other injuries. The wheel spins using dual-ball bearing technology, ensuring it glides smooth and quiet. You’ll love this wheel’s silence, safety, and durability, truly built to last. Check out the videos below or simply search “”Silent Runner Wheel”” on YouTube to witness the smooth, silent spin for yourself! The heavy-duty metal stand allows for give, protecting your pet from joint pain caused by running on a hard, fixed surface. Running tracks are textured, for excellent grip. Wheel completely disassembles for easy cleaning, no nooks for feces to hide in. Designed with a front plate for safety and containment, with natural bean-shaped openings. Features pet-preferred solid black rear wall. Measurements: 12″” wheel diameter, 3.5″” wide track, 4″” diameter openings, 13.5″” tall on stand. IDEAL FOR: Sugar Gliders, female rats, hamsters, mice, and similar small mammals (not suggested for chewing animals). What is dual ball-bearing technology Two stainless steel ball-bearings are positioned within the back plate of the wheel, ensuring the wheel glides smooth and silent. The innovative bearings SPIN around the center pin as your pet runs, unlike annoying squeaky wheels on the market that have an axle that the wheel rotates around creating friction and noise. Assembly Instructions: Remove the standard running track on your Silent Runner wheel. It is easiest to place wheel face-up on a table, insert hand into wheel to hold back plate down, and pull front plate up. Once disassembled, begin by inserting the corner of the Sandy Track into the molded edges of the black back plate for the Silent Runner Wheel. Once the corner edge is pushed in, begin working the sandy track all the way around the wheel into the groove. Once completely in the groove, push the clear connector into place connecting both ends of the track. Set the front plate on the sandy track, and starting with the side away from the connector, work one small section of the sandy track into the front plate groove. Once a small section of the track is in the groove, apply pressure (squeeze down) all the way around the wheel until the track is in place. You may need to push the last section near the clear connector in with your fingers. Set the wheel down on a table and apply pressure all the way around the wheel to secure the track in place.