Emergency flares that can be fired through a 1" ID pipe, there are 2 shells .22LR & .38SPL Blanks can be used to launch the flare projectiles, the projectiles are rifled so as to give you a 1 twist in 25" , Left or Right twist to choose from, the .22lr is offset for the rim fire. I will be making a 12 Gauge Shotgun Flares if anyone is interested. HP STL gives you a 2mm thicker shell for the 38 SPL the others are for the .22 LR https://www.youtube.com/watch?v=CswzHuzXeh8 !Don't forget to check out my other Cool designs and Follow my weekly KooKoo uploads, Enjoy ;)