【Product parameters】 Material: plastic Packing: OPP bag Specification: small: 12*12*6.5 CM medium 15.5*15.5*8CM large 18.5*18.5*8 CM Weight: small 115 grams medium 150 grams large 210 grams Package Included:1*Hamster Exercise Wheel Notes: 1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors. 2. Due to the screen difference the color may be a little different from what you expect please allow it. 3. 1.00cm=0.39