Magnus Stinger Broadhead 4 Blade 125 gr. 3 pk.. The ferrule is made from aircraft quality aluminum and offers perfect flight because it is spin tested for perfect alignment. The patented diamond tip can take on the toughest of hides and bone splitting penetration. Package Contents: Magnus Stinger Broadhead Made from knife grade stainless steel it is razor sharp out fo the package. The ferrule is made from aircraft quality aluminum and offers perfect flight because it is spin tested for perfect alignment. The patented diamond tip can take on the toughest of hides and bone splitting penetration.