Product name:Hamster Wheel Non-slip Silent Running Wheel .Hamster Running Wheel Mute Product size: 12cm/14cm/17.5cm/21.5cm Product color: As shown in the figure Product material: Plastic Product features: 1.The dimension of hamster wheel non-slip silent running wheel is 12cm/14cm/17.5cm/21.5cm,This size is fit for your hamster use. 2.This hamster wheel non-slip silent running wheel is made of plastic,It is waterproof and wear-resistant, which makes it last a long time.It doesn't sway no matter how it runs 3.This hamster wheel non-slip silent running wheel has a unique design,It has a soothing non-slip structure, thickened running plate and circular design, which can prevent hamster injury. It's not afraid to bite, which makes it stand the test. 4.You are free to adjust the height according to the amount of space you use,You are free to adjust the height according to the amount of space you use 5.You will receive 1pcs hamster wheel non-slip silent running wheel,which can meet your daily life need. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel free to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: 1 pcs hamster wheel non-slip silent running wheel