Material:It is made of solid wood and has good toughness, strong pressure resistance, no cracking and a long service life. It is evenly ground and the texture of the original wood is visible, which highlights the quality. Better protection for the floor. Disperse the stressed area of the impeller and protect the floor from scratches. Each cup thickness: approx. 2 cm / 0.8 inches BEST STABILITY - The EVA mat on the bottom is non-slip and holds the piano firmly instead of sliding. Underside of the coasters is lined with felt layer to protect the floor, as sound insulation and non-slip. Non-slip: EVA pads can reduce shock, prevent vibration on the floor and not disturb the neighbours. The thick sponge on the bottom can effectively increase the force range, prevent the piano from slipping, play a damping and shockproof role while protecting the floor. Protect the piano effectively: it can reduce the damage of the inner parts and extend the service life. A bit against moisture. Cut the direct contact between the piano and the floor. Spend least money on the best piano protection from the details. NATURAL WOOD GRAIN - Each coaster is a little different due to the real wood grain. If you have any questions about this product, please contact us. We try our best to help you solve your problem.