Number 1 recommended wheel and disk for sugar gliders by owners and breeders. Made in the USA. The freedom disk is a different way for your sugar glider and small mamal to get its exercise. The holes in the disk allow for waste to fall through and also allows for grip. Its 1 piece design makes for easy cleaning. Our disks come with your choice of 1 inch or 3 inch heights or a cage mount. All disks have stainless steel bolts, washer, and nut to avoid rusting. They also have dual, high quiality, sealed, carbon steel bearings for smooth, silent, and long lasting use.