New Hornady® Ammunition Cartridge Cases 100 Premium Brass Hand Inspected 45 Caliber:Brass V2 Defender Mask Features: Ventilated Thanks to its croc V2 Defender Mask Features: Ventilated ABS shell provides a strong layer of defense that helps minimize impact Tested against impact from 70 mph softballs and 100 mph baseballs S3 Technology: Shock Suspension System absorbs the energy from frontal impacts for reinforced protection DuPont™ Kevlar® liner covers the interior of the shell to minimize tearing and abrasions High impact memory comfort foam along the chin pad delivers a cushioned for the best performance UNIFORM CASE WALL THICKNESS Benchrest shooters have long known that uniform case wall thickness is vital to accuracy Higher concentricity also aids in a uniform release of the bullet on firing