A Boomwhacker is a percussion instrument in the plosive aerophone and idiophone family.[1] They are lightweight, hollow, color-coded, plastic tubes, tuned to a musical pitch by length. They were first produced by Craig Ramsell through his company Whacky Music in 1995. The term is now a registered trademark by Rhythm Band Instruments.[2]
greenberg
was invoked but never defined (see the help page).