Polished car glass with a combination of Scotch Bright type T and glass woman. Exquisitely the oil film and the scales disappeared, and we were able to construct the water repellent coating. Blocks themselves are made of soft material and scratches will not hurt even if the corner hits the body accidentally. Since the pressure to the construction surface is dispersed to it, it is good to be able to apply force evenly to the ground plane. Because the price is high compared to the material, one star is negative.