Sonic Pros are being fazed out by the manufactuer.  They are one of the “standard” broadheads we at Wyvern Creations recommended for all crossbows.  We have a bunch left over at a great price...pick up a few extra packs.  Field point flight and unbeatable durability, these razor sharp heads are available 100, and 125 grain weights,  Sonic Pro’s  feature 1.0" cut dia. "DenseMax" blades coupled with a new stouter center ferrule. Sold in three packs with a free set of target practice blades included, Sonic Pros are the ultimate Sonics!