The leather sheaths of Marttiini knives are made of either vegetable or chrome tanned ox hide. The leather hides are purchased from both Europe and South America. The sheaths are made of both dyed and natural colored leather.
The knife sheaths are still made mostly by hand. Each sheath has to be exactly the right size and shape, so it forms a fitting pair with the knife. A section of the leather is cut with a die cut tool, and the seams are glued before sewing. Most sheaths have a plastic skeleton inside that supports the sheath and prevents the blade from cutting the leather sheath.
The printing on the sheath is made on either the cut leather piece or the finished sheath. Rivets, and in some cases a bronze collar band, strengthen and adorn the sheath.