The revolutionary TKO (Tin KnockOut) shotgun sabot is the world's first lead-free slug designed for use in both smoothbore and rifled barrels, using any choke. Brenneke has created a 12 gauge projectile made of tin - yes, tin - that provides outstanding penetration, stopping power, accuracy, velocity and energy (2607 ft/lb at 2001 fps), yet is completely safe for you and other living creatures.