The material used is domestic beech. The cross-section is approximately 40 x 15 mm. The outer dimensions of the frame are approximately 830 x 500 mm. The range of motion on the short sides is approximately 150 mm each. The inner dimensions of the frame are 721mm x 417mm. Urethane finish. Grooves are made on the long sides so that the short sides fit in, so it won't shift or become diamond-shaped even when tension is applied. Furthermore, to prevent slipping, saw marks are intentionally left on the cut surfaces. 〈Request〉 We make every effort to create these, but there are limitations with handmade products, so please understand that minor scratches may occur during processing. Solid wood is used. It has been thoroughly dried and any warping has been corrected, but please understand that shrinking and deformation may occur over time. Due to increased material costs, please refrain from requesting a price reduction.