Set of 4 rubber soundproof circular pads with non-slip treatment. I've used these for an upright piano for nearly 10 years. I've only lightly dusted them, so I apologize, but they will be sold as is. They will likely become cleaner if you clean them. Thank you for your understanding. - Quantity: 4 - Shape: Circular - Material: Rubber - Back: Non-slip treatment - Application: Soundproofing and vibration absorption Thank you for looking.