Sandvik 12C27 stainless steel patented by Opinel is renowned for its ease of maintenance. Similar in chemical composition and mechanical properties to type 440A. Thanks to heat treatment, it has good hardness. The carbon content of the steel is at least 0.40%, which allows for a very satisfactory cut and is not susceptible to corrosion.

Beech wood handle is the most commonly used material by Opinel . The wood comes from France, beech is hard, durable. When exposed to sunlight, the color of the light changes from yellow to pink. This wood is characterized by the presence of numerous small, dark lines.