Magnus Black Hornet Replacement Main Blade 4 Blade 150 gr.Magnus Black Hornet Replacement Main Blade 4 Blade 150 gr. Replacement main blades for Black Hornet Ser Razor broadheads; Compatible with both 2 blade and 4 blade, 150 grain models; Ensures maintained sharpness and precision; Pack includes three blades; Made in America with a Lifetime Guarantee; Advised to spin test for true flight post replacement Item Category Code: 1300 Product Group Code: 1300G Product Sub Group 1: 1300G5 Inactive: No