Niteangel Super-Silent Hamster Exercise Wheels - Quiet Spinner Hamster Running Wheels with Adjustable Stand for Hamsters Gerbils Mice Or other Small animals Why we designed Niteangel Super Silent Series Hamster Exercise Wheel? As all known, wild hamster runs about 8-miles at night, a reasonable hamster wheel design means lots of running fun & exercise chance for a family hamster, it also benefits for their physical & mental well-being at the same time We studied kinds of hamster wheels and noticed most of the hamsters' owners care about the safety & noise of the hamster wheels. We tried & designed many times, find out and fix the problem again & again, finally, we achieved this Niteangel Super Silent Series Hamster Exercise Hamster What're the special designs of Niteangel Super Silent Series Hamster Exercise Hamster? <1>. Dual-Ball bearing Design - Helped to reduce the squeaking sound due to high rotating, also less the wave of running drum when hamster running, more stable & soundless. Brings your a super silent sleeping time, no matter your hamster's cage at other places or in your room <2>. Reasonable Size - Due to different sizes of Dwarf hamsters and Syrian hamsters, we devised 2 sizes separately for them A. 8-inch Inner Diameter Hamster Wheel with the 3-inch wide running track, which fits for most of the dwarf hamsters, small mice, gerbils, or similar sized pets, except the largest dwarf hamster B. 10-inch Inner Diameter Hamster Wheel with the 3.7-inch wide running track, which fits for most of the Syrian Hamsters, mice, gerbils, rats, degus or similar sized pet, except the largest Syrian hamster <3>. Comfort Hamster Wheel - Reasonable Size of Running Drum & Wide Running track brings a relax back feeling, as they do not need to bend their back when running, let them enjoy their endless running time, help them to build own muscle, keep them happy & mental well-being