The Barnes .41 Magnum XPB bullets feature patented X-Bullet technology with all-copper lead-free construction delivering superior performance for hunting and self-defense applications.Barnes .41 Magnum (0.410'') 180 Grain Flat Base bulletsAll-copper lead-free X-Bullet technologyDramatically increased penetration over conventional jacketed bulletsSuperior expansion and weight retentionExceptional accuracy with no harmful residue20 bullets per boxIdeal for hunters and shooters seeking maximum energy transfer and reliability these XPB bullets provide unsurpassed performance while maintaining a clean lead-free design for safer practice environments.