Opinel No10 is a big folding knife that should not be considered a "pocket" knife. Many people have found that its size make it a perfect every day steak knife that can be folded and stored in the kitchen drawer. Of course this knife has many other uses but please consider its size if you are in the market for a "pocket" knife.
This knife has a stainless steel blade (12c27 Sandvik Stainless steel to be precise). The blade will not rust, however try to avoid leaving your Opinel knife in damp environments for too long and dry the blade after each use. The handle is made of wood and may expand and contract with extreme humidity (or lack of) and will temporarily affect the mechanism.
This knife features the Virobloc Safety ring. The Virobloc safety ring was invented and implemented in 1955. This simple yet effective locking system greatly improved the original knife.The ability to help prevent the blade from opening when closed was added to the Virobloc in 2000.