The Upgraded Quiet ChillaWheel you will receive is brand new and has never been used. The wheel is made from high grade steel parts and the bearing spins very freely. This wheel is also good for other small animals such as degus, squirrels and rats as well as chinchillas. Steel was chosen for the upgraded ChillaWheel's construction as the cheaper materials were found to bend and break and plastic is toxic to chinchillas. Steel was also chosen as it's very easy to clean and doesn't hold bathroom smells. The upgraded ChillaWheel is 16 inches in diameter and has a 4 inch textured running surface that's easily gripped by your chinchilla. It also has a sloped running surface to allow your animal's bathroom droppings to fall off the wheel during use. The wheel's flat surface is meant to keep your chinchilla's paws from getting caught between wheel wires and the size of the ChillaWheel is perfect for protecting your chinchilla's back from spine curving. This wheel is extremely quiet and near silent. The ChillaWheel is very safe and our own personal chinchillas have been running quite happily on these for years now. Each wheel comes with a free sample of our happy snacks. Our happy snacks consist of organic apple wood sticks hand selected from HappyChilla preferred orchards and our well received HappyHay consisting of a blend of only the most delicious and freshest hay types from local growers around the San Joaquin valley.