TASER® X2 Series Replacement Cartridge 2-Pack (for X2 Series models)Compatible with the TASER X2 Professional Series, these replacement cartridges are perfect to keep stocked alongside your TASER weapon. Each cartridge contains a primer, gas capsule, probes, serialized tags and conductive wires for accurate firing. TASER is a trademark of Axon Enterprises, Inc., registered in the U. S. and other countries.