Double Tap Bonded Defense Features Double Tap s Bonded Defense JHP bullets are engineered to provide ultimate stopping power. The bonding process ensures the jacket and core do not separate on impact delivering full-weight retention and deep penetration through barriers. This is critical in self-defense situations where reliability can make all the difference. Double Tap Bonded Defense Specifications Brand: Double Tap Family: Bonded Defense Bullet Type: Jacketed Hollow Point (JHP) Caliber: 9mm Luger +P Case Material: Brass Grain: 147 gr Rounds Per Box: 20 Muzzle Velocity: 1135 fps