This is a GEX Harmony Wheel 14cm. It's the perfect size for dwarf hamsters and similar pets. It has suction cups on the back, so you can place it and stick it to a wall. I used it for about six months, and it was very quiet, making almost no noise. My Djungarian hamster used it, but it's no longer in use due to old age, so I'm selling it. There are no noticeable scratches or stains, but please understand that this is a used item before purchasing. Size: 14cm in diameter