The Valken Thunder V2 Co2 Sound Simulation Grenade Shells are the next generation of Valken Thunder V sound grenades. This airsoft simulation grenade shell and emits noise only when used in conjunction with the Valken Thunder V2 Core (sold separately). Designed to mimic the loud “bang” of a tactical “flash bang” grenade, these replacement shells are compatible with 12gram Co2 cartridges that, when the core’s pin is pulled, fill the shell with Co2 and then approximately 3-4 seconds later it ruptures, creating a 130 decibel bang certain to distract and disorient opponents. We recommend using our Valken Thunder V2 Co2 Sound Simulation Grenade Core.