1. Use waterproof fabric for all seasons 2. Dustproof, easy to install 3. Lightweight and easy to fold and carry 4. Expansion size: 61 keys: 100 x 39 x 18cm, 88 keys: 130 x 29 x 15cm 5. Gross weight: 61 keys: 0.18 kg, 88 keys: 0.2 kg 6. Note: the product contains only dust cover, excluding the piano other items
