High Quality Material: Made of high quality ABS material (transparent) with fine texture and pressure resistance, it can protect your piano casters from direct contact with the floor. Good toughness, pressure resistance, crack resistance and durability. The sturdy cover protects your piano wheels or legs from slipping and rusting, which makes your piano more stable. .2. Features: The feet protect the piano without affecting the beauty, creating a truly elegant appearance, and spending the least money on the details to protect the piano. The hidden transparent appearance makes it more compatible with your home decoration style and floor color, making your whole space coordinated and unified. .Function: High quality ABS holds the piano in place, reducing the force on the floor. The piano foot pads can protect the piano wheels or legs from rusting and slipping, which makes your piano more stable. In order not to disturb your neighbors on the ground floor while you practice the piano, you need such a wonderful mat. .4. Easy to use: lift or tilt the piano slightly, then place a foot pad under the bottom or corner of each foot. Wide side down, then lay the piano down. Piano foot pads can be reused without causing waste, saving you time and energy. .5. Package Content: The package includes 4 cups which are featured by their excellent load bearing capacity. Cup Dimensions: Outer Diameter: 88 mm, inner diameter: 52 mm, height with pad: 20mm. This size is suitable for one-wheel piano legs. .