Rubber mixture is extremely well suited as the material for knife handles. An ergonomically shaped rubber handle can be washed in a washing machine, is easy to maintain, hygienic and safe. A rubber handle feels pleasantly warm to touch even under outdoor conditions, for instance in freezing or wet weather. The roughened part of the handle and the finger guard guarantee a safe and firm grip for knives of the Condor-series.

The leather sheaths of Marttiini knives are made with either vegetable or chrome tanned oxhide. The leather hides are purchased from both Europe and South America. The sheaths are made with 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 model iron, and the seams are attached with glue before sewing. Most sheaths have a plastic piece inside that supports the sheath and protects the blade.

The printing on the sheath is made on either the cut section or the finished sheath. Rivets, and in some cases a bronze collar, strengthen and adorn the sheath.