The Thunder 100 doubles as a shotgun simulator and bumper thrower. No need for poppers or primers. It is 100% safer than current shotgun blanks. One can of fuel is equivalent to $300 in poppers. Can be used equally well with right or left handed throwers. No moving parts! Will shoot in the rain and requires no oiling or cleaning. Built in redundant safeties guarantee safety and reliability. Dogs know the difference between primers and shotgun sounds. Use a product that gets them really excited and can be heard for hundreds of yards!