Armour-piercing discarding sabot (APDS) is a type of spin-stabilized kinetic energy projectile for anti-armour warfare. It consists of a sub-caliber round outfitted with a sabot to increase velocity compared to a full caliber round by firing a smaller lighter projectile from a relatively larger propellant-charge. The higher velocity gives the round increased penetration against armour. To not break at high speed impacts, APDS rounds traditionally features a hardened core made by tungsten or other hard material.