The FEC-8 is a pre-loaded charge for the FESA-2 'Gravel' ferroelectric shatter sidearm, containing approximately 400 ceramic-metallic composite microbeads per charge in a ferroelectric capacitor-driven magazine. When fired, the weapon's integrated ferroelectric capacitor generates a pulse that simultaneously propels and electrically charges the microbeads, which emerge as a cloud of electrostatically active ceramic fragments that deliver both kinetic impact and electrical discharge on contact.

The microbeads are manufactured from a piezoelectric ceramic composite that retains electrical charge for several seconds after the ferroelectric pulse, meaning each bead continues to deliver micro-shocks after embedding in tissue or clothing. The cumulative effect of 400 charged microbeads impacting a target at close range produces an overwhelming sensory experience — the kinetic impacts are individually minor but collectively devastating, while the electrical charges disrupt motor function and cause involuntary muscle contraction across the entire contact area.

The magazine holds 8 charges and is integral to the weapon — field replacement is not intended, and the weapon is designed as a carry-and-use platform rather than a sustained-fire tool. When the 8 charges are expended, the magazine must be replaced at an armorer's bench, a process that requires approximately 10 minutes and specialized tools. This design philosophy reflects the FESA-2's intended role as a concealed close-quarters weapon for situations where a single engagement is expected.