Composition B, colloquially "comp B", is an explosive consisting of castable mixtures of RDX and TNT. It is used as the main explosive filling in artillery projectiles, rockets, land mines, hand grenades, sticky bombs and various other munitions. The standard ratio of ingredients (by weight) is 60% RDX (detonation velocity of 8,750 m/s) and 40% TNT (detonation velocity of 6,900 m/s).