Brenneke's 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. It provides outstanding penetration, stopping power, accuracy, velocity, and energy yet is completely safe for you and other living creatures. The tin provides the optimum combination of velocity, penetration, energy, accuracy, and stopping power, especially in combination with the distinctive Brenneke weight-forward design and massive frontal area.