- Be completely flat on the inside. Hamster/rat wheels have a bar in the middle which will cause spinal injuries if a glider hits it. Gliders tend to "hop" or bounce through the wheel instead of running flat along the bottom. You can't have anything protruding through the center of the wheel!
- Have no rotating bearing on the inside. Because of the way which they hop/run, gliders can get their tails snagged on any rotating bearing mechanism inside a wheel. Our wheels are designed with the bearing on the outside in order to prevent serious injuries.
- Have tracks/mesh for a glider to grab onto instead of a solid running surface.
- Not have a nail trimming paper covering the entire wheel. Since gliders like to grab onto tracks, it'll be painful for them to always be landing on the rough nail trimming paper.
- Be completely open in the front. A wheel with a cover can cause serious spinal injuries if a glider accidentally hits the cover when trying to jump in or out of the wheel. This can be especially dangerous because often times you will find more than 1 glider in the wheel at any 1 time!
- Be at least 12 inches in diameter or more. Since gliders are bouncy, they need more than enough room to run without bending their backs.