Sonic Boom has taken its time to research and custom build their targets. Through research, Sonic Boom has found the best possible raw ingredients available to date, which in return, provides one of the largest explosions and loudest booms of any exploding target on the market. Sonic Boom has catered to the need of every shooting enthusiast with the Rimfire Targets. With ten (10) individual targets specifically designed for closer range and lower caliber firearms, it's the perfect compliment for any target shooting. Sonic Boom produces targets with high quality, non-hazardous, non-toxic and stable chemicals. The targets use a two part mixture that are easy to mix and easy to useâ€”simply mix and shoot. To ensure safety, shooters must be at least 100 yards from exploding target. To initiate explosion, rimfire target must be struck with a projectile traveling at a minimum of 1100 fps.