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The AMT consists of antimatter contained in a magnetic field, and an outer shell. When the outer shell contacts the target, a small explosive charge breaks the shell (sending its components forward into the target. This is most useful for disably a single, contained, externally-mounted system (such as a shield projector or torpedo launcher), or creating a small hull breach.
The greatest challenge for this weapon was finding a way to get it past the shields of the enemy vessel; the antimatter does very little to energy shielding. Because of this, a set of micro-phasers are imbedded around the AMT launcher, designed to work on power from a of the warp core (see: Warp Phasers). These strike a single point on the enemy shields, then expand into a small cylinder when a breach is created to keep it open while the AMT travels through this cylinder. Because of this delivery system, however, the AMT has a very limited range, and is useful only if the target is more or less stationary relative to the attacking ship.
~Jeremy Lennert, Simon Dark of the 7th Fleet