Product name: Little pet running wheelMaterial: PlasticProduct size: 13cm in diameter and 6cm in widthSuitable object: dwarf hamsterProduct features: integrated seamless silent running wheel.Features: Silent running wheel, environmental protection and durability, physical fitness, free rotation.The anti-slip pattern protects your pet from slipping due to inertia during running.One-piece molding, no installation gap, no need to worry about jamming.Reminder: The inner shaft of the running wheel is made of metal bearings. Do not wash the bearing with water when cleaning the running wheelPackage contented:1 x Little pet running wheelNote:1. Please Allow 1-3cm Differs Due To Manual Measurement.2. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.Please refer to the received product. Thank you for your understanding.Please allow slight dimension difference due to different manual measurement.