Magnus Stinger Broadhead 2 Blade 150 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 Two blade head with stainless steel replaceable blades that are .046 thick. They weigh 150 grains and have a 1 1/8 cutting diameter.