Silent Runner Wheel 12" Wide 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. If you like this wheel you'll love the Sandy Track, AutoClean Track, Wheel Attachment, Grip Strip or get the Value Pack and $AVE. Value Pack includes the Wheel, Trimmer Track, AutoClean Track, Wheel Attachment and FREE Grip Stripe. This wheel is great for multiple gliders, hedgehogs, chinchillas & large rats (non chewers), and other non chewing small pets. I now recommend them for marmosets and tamarins as well. I recently took in 4 pairs of marmosets. Each cage was deck out with all the normal decor (branches, pouches, hammock, toys and this Silent Runner. I laughed and ask who on earth would think to put this wheel in a monkey cage. Go figure these marms love this wheel. These are breeder monkeys that don't get out as often as pet monkeys mind you, but when they get bore they start running like crazy. I've started adding them to my cages and slowly they are starting to use them. The monkeys that I acquired started young with this wheel so I believe that makes a big difference. I use this wide green wheel & remove the front and attach to the side of the cage.

• 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.