PUMA IP Wolf Eiche Oak Wood. PUMA Silver IP Series. As part of a search to develop a new line of German-designed, high quality knives, PUMA began working with Spanish knife makers in 2003 to develop the Silver IP product line. The Silver level PUMA knife assortment has developed into a beautiful assortment of fixed and folding knives, using German specifications, American styling, and fine Spanish workmanship. Every knife has been Rockwell tested for hardness and bears the mark of the diamond testing needle on the right hand side of the blade. Put your hand around a new Elk, Wolf, Fox or Wildcat and you will understand why PUMA is so proud of this line. Blade Length: 3 1/2. Blade Steel/hardness: 440C/ 57-60 HRC. Blade Thickness: 3.5 mm. Overall Length: 8 2/9. Scales: Oak Wood. Nickel Silver Bolsters. Sheath: Leather.