Hornady s Critical DUTY handgun ammunition is built to meet the needs and requirements of law enforcement and tactical professionals, as well as law abiding citizens who prefer a full-size handgun for personal protection. FlexLock bullets are rugged, heavy-jacketed bullets that deliver virtually barrier blind performance when shot through common urban barriers. In other words, total penetration, weight retention and expansion are practically the same. Although designed to work flawlessly in all handguns, these "full power" loads are not optimized for short barreled or concealed carry style handguns. FLEXLOCK BULLET incorporates two revolutionary Hornady features: the patented Flex Tip that initiates consistent expansion every single time while preventing any clogging, and the heavy duty InterLock band that locks the jacket and core together. CANNELURED BULLET WITH CRIMPED CASE ensures no bullet setback during feeding. INTERLOCK BAND works to keep the bullet and core from separating for maximum weight retention and proven terminal performance through all FBI test barriers. CORE is made of high-antimony lead making it extremely tough, delivering controlled expansion for unparalleled terminal performance consistency through all FBI test barriers. It s also more economical than similar bonded bullets. Product Specifications Caliber: 9mm Luger +P Bullet Weight: 135 Grain Bullet Type: FlexLock Product Line: Critical DUTY Muzzle Velocity: 1110 fps Muzzle Energy: 369 ft/lbs Quantity: 25 Rounds per Box