At the heart of the MonoFlex ML is the .452 diameter MonoFlex bullet – a monolithic solid projectile made from a copper alloy and topped with the patented Hornady exclusive Flex Tip design that works as a catalyst for uniform expansion, even at the low velocities of longer range impacts. The MonoFlex won’t separate and retains 95% of its original weight. Specifically engineered to provide phenomenal accuracy, penetration and high weight retention, the MonoFlex ML is a nontraditional / alternative metal construction bullet option that is a fantastic choice for ALL hunters. Mfg: Hornady