ONE 5.56 ELP ITS4B IT 4 BALL STEEL PROJECTILE CARTRIDGE. HEADSTAMP PSD 14. 50g. IT’s 4-ball (IT’s Family 4-Steel Ball) projectile. This is a short body profile, thick wall projectile engineered for the Mil-Spec twist rifling to accommodate semi, burst and full-auto (not-extreme heat) firing.