This kit contains ten individual targets specifically designed for closer range and lower caliber firearms. The targets use a two part mixture that are easy to mix and easy to use, simply mix and shoot. Targets are made with high quality, non-hazardous, non-toxic and stable chemicals. To ensure safety, shooters must be at least 100 feet from exploding target. To initiate explosion, rimfire target must be struck with a projectile traveling at a minimum of 1100 fps.