Description: Hamster Ball SizeDiameter about 18cm/7inch, great for hamster, mouse and other small animalsQuality MaterialHamster exercise ball made of PP materials, environmentally friendly, transparent ball, convenient for the owner observe the pet's every moveAdjustable: Hamster running wheel with acrylic stand adjustable height ranging from 20cm~27.5cm for your convenienceSilent: Hamster Wheel equipped with a dual bearing system, it will not make noise whether it is day or night, and will not disturb your restInteractive ToysFun exercise toy to maintain your hamster alertness and agility, provides interactive fun for the pet and the owner Specification: Material: PP PC metal Size Chart: Hamster exercise wheel: 18cmx6cm/7.09inx6.30inStand: 18cmx12cm/7.09inx4.72in Package Includes: 1 Hamster Exercise Wheel with Stand Note: Please allow slightly errors due to manual measurement and different monitors.