Blammo Boomers (theatrical blanks) are there when you need to be heard in an emergency or other situations. This 120+ decibel noise maker gives you the comfort of knowing that you will be heard. These 2 3/4" long black powder boomers are blanks on steroids! Guaranteed attention getters with a boom! Flash and smoke! Looks scary and will definitely turn that would be burglar around! 23/4 round