Spring / shock absorption is a general term for shock absorption parts such as springs, shock absorbent materials, shock absorbers of various shapes and applications, etc. and related products. Springs include general-purpose torsion springs, tension springs, compression springs, etc. and other special-purpose products such as constant-force spring, battery springs, etc. The spring material is mostly stainless steel wire or piano wire, but there are also high-performance products made of lightweight and highly corrosion-resistant titanium alloy. Shock absorbers are used to absorb shock during transportation and assembly of precision equipment, electronic equipment, etc. It is also effective at reducing noise by impact mitigation. Shock absorbers can be selected from types that adjust the damping force or fixed types according to the application. Shock absorption materials such as urethane, rubber, sponges, and felt have excellent weather resistance and chemical resistance, and can be used for high-performance products such as foamed polyethylene sheets suitable for pass-through cushioning materials, and O-rings, packing, etc., and there are a wide variety of products such as general-purpose products such as rubber sheets with excellent abrasion-resistance and oil resistance, etc.