The Liberty heads are basically a larger version of the sonic line of broadheads. The main difference being the ferrules are made from aluminum rather than steel. Liberty Broadheads slice on contact, fly identical to your field points - even at speeds in excess of 300 fps - and blast through big game with gusto. They're also the world's only three-blade, cut-on-impact broadheads with individually replaceable blades. Hardened .036"-thick stainless steel blades are held rigidly to the ferrule by a rear locking nut. Per 3.