Enjoy the power of surgical precision during the takedown - the Ravin Aluminum Broadhead features rear-deploying blades, which open on impact to deliver a highly-effective 2-inch cut. These mechanical broadheads have an internal spring clip, eliminating the need for lock rings and o-rings. 3-Pack Aluminum 7075-T6/Steel 12L 14 Tip Extreme Accuracy and Penetration Internal Spring Clip, No Lock Ring or O-ring Rear-Deploying Blades Deploys Upon Impact 100 Grain 2" Cut 500 FPS Ravin crossbow Tested and Approved