These smoke grenade caps are designed for use with the Thunder B flashbang training grenades and the Thunder B smoke shells. The reusable smoke grenade caps make the grenade much louder when used with the smoke shell replacements.
One set of these caps is included with the basic core set, but are not included in the Flashbang 12 pc core set. The smoke grenade caps screw onto the top and bottom of the smoke grenade shells and prevent the grenade from blowing out the bottom of the shell. Without the caps, the smoke grenade shells do not explode properly.