I bought this for my degu, but it was too small and didn't fit, so I stopped using it after a few times. It's not dirty, but I washed it thoroughly. The purchase price was 1380 yen (excluding tax). Silent design flat type, 17cm silent wheel. - Model name: Silent Wheel F17 - Size: 17cm - Features: Silent design - Material: Plastic - Target animals: Small animals - Design: Flat type Thank you for looking.