The material used is domestic beech. The cross-section is approximately 40 x 15 mm. The outer dimensions of the frame are approximately 930 x 600 mm. The range of motion on the short sides is approximately 150 mm each. The inner dimensions of the frame are 821mm x 517mm. 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. We have thoroughly dried and removed any warping, but please understand that shrinking and deformation may occur over time. Due to increased material costs, we kindly ask that you refrain from asking for a price reduction.