Silicone Material: Made of quality silicone, these silicone buttons are designed to provide a experience, ensuring that every press feels smooth and responsive.Compatibility: Designed to fit the PSR 550 model, these silicone keyboards are also compatible for other models in the series,such as PSR 550,SR ,PSR E413, 230,PS 710,RTF1, 3,DJ 8, XJ 3,E423,E433 and etc.Conductive Contact Points: These silicone pads buttons have conductive silicone contact points on the bottom of each key, which is an important interface between the keyboard and the digital piano PCB board.Comprehensive Package: The package contains two electronic piano keyboards, ensuring that you have everything you need to install or replace your digital piano keyboard, so that your instrument always performs at its best.Playing Experience: Enhance your playing experience with these reliable and efficient silicone keyboards designed for pianos Specification: Material:Silicone Size Chart: Length:15.91cm/6.26inchWidth:3.45cm/1.36inchHeight:1.15cm/0.45inch Package Includes: 2Electronic Piano Silicone Pads Buttons Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.