The Madbull PS-02 Gas Powered Grenade is an excellent prop for MILSIM airsoft. The grenade is basically a gas reservoir with a large release path to create the popping sensation when the grenade "explodes" (No explosion actually takes place). The grenade "explodes" based on the time set by the timing device. The outer most portion of the grenade is foam, making it perfect for rolling into a room. Airsoft GI does not recommend throwing the grenade anywhere. This is an Airsoft Prop ONLY! and should only be used as such.