The Opinel No.05 Folding Knife is a small everyday folding knife, with a 6 cm (about 2-3/8 in) blade in carbon or stainless steel and a beech handle.
Opinel says Pablo Picasso carved his figurines with a No.05. Opinel's XC90 carbon steel is very hard, cuts well and is easy to resharpen, but it can rust, so dry it after use and oil it now and then. The stainless steel needs no special care in ordinary use. It's too small for the Virobloc safety ring, which Opinel fits from the No.06 up.
Joseph Opinel began making his folding knives in Savoie, in the French Alps, in 1890, as a simple knife for working people. By 1909 he had registered the crowned hand as his trademark, and in 1955 Marcel Opinel invented the Virobloc safety ring. The Museum of Modern Art in New York has exhibited the Opinel as a design masterpiece, and the Victoria and Albert Museum in London chose it for an exhibit in 1985.