Opinel No 4 stainless steel blade. This is a small knife, blade length 5cm. This knife does not have the locking collar that the larger knives have.The blade is made from Swedish Sandvik steel modified 12C27, which requires no special care. Of course all pocket knives should be kept dry and well maintained. The blade is stamped 'Opinel Inox' (stainless steel) to distinguish it from the carbon steel version. Made in France.