The Silent Runner PRO pet exercise wheel provides a soft grid track that provides a flexible running surface and helps to prevent long-term injury to muscles and joints. The open-face front plate allows safe and easy access for entry. The properly spaced grid track provides optimal sanitation by helping keep the track free from urine and feces. The new easy-connect track allows assembly without a separate track connector. Whisper quiet dual ball bearing technology and the new wider cage attachment plates make the new Silent Runner PRO a great choice for providing your pet with a safe and quite means of exercise. Built to connect directly to the side of most wire pet cages. Designed specifically for pet sugar gliders