This is a special product. It includes two sets of 9mm and 6mm plates (8 plates total). These wood plates are specifically designed for skin-friendly campus board training. Made from high-strength walnut wood, the edges are rounded with a taper. This taper reduces stress on the skin while providing an excellent grip. Improved hold strength will dramatically increase your limit grade. Train your fingers with the wood plates and push your limit grade higher. The 6mm plates are especially high-load. Set Contents: Width 13.9cm x Height 4.2cm A set of 2 plates each of 9mm and 6mm thickness. Includes dedicated wood screws (3.5 x 25mm) We also sell a lower-strength 15mm/12mm set. Important Notes: Do not use mounting screws with a shaft diameter of 4.0mm or more. This may cause the plate to crack under load. Use the included wood screws (3.5 x 25mm) or 3.8mm course thread screws (25mm or longer) for installation. Tighten the final turn by hand. As the product uses natural wood, there may be slight variations in width and height. Custom dimensions are available (1500 yen per pair) Thicknesses from 3mm to 15mm are available in 1mm increments. Thicker than 15mm is also possible. Please inquire separately.