SONIC BOOM GENDER REVEAL KIT BOY Announce the big news with the Sonic Boom Gender Reveal Kit. Comprising 1 pound of Sonic Boom rifle target and custom-made, colored chalk, this kit Simply make your gender reveal as exciting as can be. Just mix up the target, place the chalk on top and shoot the target with your centerfire rifle from at least 100 yards away to trigger a colorful explosion accompanied by a satisfying boom.