Magnus Black Hornet 4 Blade 125 GR Broadhead (3 Pack) Magnus Black Hornet, 125 grain 4-blade The Black Hornet main blade is .059 thousands of a inch, the bleeder blade is .040 thousands of a inch All Magnus Black Hornets perform flawlessly from the fastest bows on the planet... with field-tip accuracy. The quality of our construction is unmatched, but if you break one, we will replace it according to our Lifetime Guarantee.