Thorn Expandable Crossbow Broadheads use patented â??hidden bladeâ?쳌 technology to achieve true field-point accuracy. At impact, the Rip-Tip delivers bone-crushing penetration and deploys the hidden blades creating a huge 1 3/4 Inch wound channel. Rated for crossbows up to 350 fps. Includes (3) broadheads and (6) sheer pins.