I use the exotic nutrition wheel and I really like it. Many people reccomend the stealth or raptor wheel as they have the mesh material but that is why I don't like it. People say that the gliders get better grip and the way allows for the poop and pee to not get stuck. Personally, my glider doesn't poop or pee a whole lot on his wheel. Also, he has fine grip with the exotic nutrition wheel and so like hay it is a flat bottom. I am scared that his feet or toes could get caught in the mesh. I might be a bit biased though as you are never supposed to use a mesh wheel for hamsters or chinchillas or any rodent and may be carrying that over for the gliders. But overall the exotic nutrition one is great. Just whatever wheel you pick, make sure it doesn't have a center axle. The Wodent wheel for example does which makes it very dangerous as glider hop while they run and their tails could get caught in the center axle part. Good luck:)