Amon Road Noise Reduction Plate M10 6 pieces Discontinued New, unused, but opened. I bought a pack of 10 and used 4. This is a discontinued product, so if you're looking for it, please consider it. Quiet planning using a special vibration damping alloy, absorbing about 30% of vibrations. - Product Name: Quiet Planning - Size: Inner diameter 22mm, Outer diameter 10.5mm (M10 size) - Quantity: 6 pieces - Features: Uses a special vibration damping alloy to absorb vibrations - Effect: Absorbs about 30% of vibrations