Ball bearings keeps the wheel whisper-quiet when in use-no more squeaks or rattles! Use with the stand or remove from the stand and fasten to cage wires The all-plastic wheel and base disassembles easily for cleaning Attractive translucent blue wheel on a clean white base Available in three sizes-for mouse & gerbil up to hedgehog & guinea pig Prevue Pet Products 9 1/2" Quiet wheel 90018 is constructed entirely of plastic with ball bearings that keep the wheel whisper-quiet when in use. No more squeaks or rattles! Great for providing exercise inside or outside of the cage. Use with a stand or remove from the stand and fasten to cage wires. Base disassembles from wheel making cleaning a breeze. Wheel measures 9 1/2" long, 5 1/8" wide and 10 3/4" high. Hand wash and dry thoroughly before use. Do not submerge wheel in water and do not place in dishwasher.