Features: 100% brand new and high quality Premium Material: Made of high quality PVC material, which is safe, non-toxic, eco-friendly and durable. Easy to Install: Easy to fix to wire cage with included screw and bolt. Silent Working: The wheel works noiseless, keeping quiet while the pet is exercising which does not affect the pet's fragile hearing, nor does it disturb you, providing a funny place for pets to play and rest. Sizes & Colors: We offer 4 sizes to meet the need of different sized small pets. 2 colors blue-white and pink-white to choose from. Wide Application: The plastic running wheel is suitable for Hamsters, Gerbils, Rats and other small furry animals. Help your little pet exercise more and develop balance ability and agility. Package Includes: 1 Piece Hamster Plastic Running Wheel (S/M/L/XL, Blue White/Pink White) Specifications: Material: PVC Color: Blue White/Pink White Size: S-Diameter Approx.13cm/5.12in M-Diameter Approx.15cm/5.91in L-Diameter Approx.17cm/6.69in XL-Diameter Approx.22cm/8.66in Weight: S-Approx.145g M-Approx.195g L-Approx.245g XL-Approx.305g note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you