Casstrom No.10 Swedish Forest Knife Curly Birch. The blade is 10cm long and made using 3.8mm thick Austrian made O2 high carbon tool steel B hler K720 and heat treated to achieve a hardness of 58-60 HRC. The knives are ground with a shaving sharp flat Scandinavian grind and have a satin finish. This steel in combination with the grind makes these knives very strong yet very easy to sharpen and it takes a great edge. The handle is made from Curly Birch but also available in Classic Oak or green Canvas Micarta. There are black liners between the handle scales and steel to enhance durability over time. The wood has been treated with a traditional Scandinavian linseed oil based varnish. The knife comes with a sturdy welted sheath made from cognac brown 3mm vegetable tanned full-grain leather. The sheath features an extra wide belt loop a fluid draining hole and a lanyard hole. Specifications for Casstrom No.10 Swedish Forest Knife: Manufacturer: Casstrom Blade Length: 3.88 in Overall Length: 8.63 in Blade Material: K720 Blade Grind: Scandinavian Handle Finish: Satin Sheath Material: Leather Package Contents: Casstrom No.10 Swedish Forest Knife Casstrom 13104: No.10 Swedish Forest Knife Curly Birch