The thread cylinder is made out of high-grade refined steel, the springs out of stainless harmonic steel, the notching scale cylinder and the slotted nut out of anodised aluminum. The material used for the Plunger Pin offers excellent glide- and wear-behaviour by using aluminum-, aluminum-carbon- or carbon-arrows Available lengths 17.5-24.5mm(short 25.5 -32.5mm (Long)