Boomwhackers Diatonic C-Major Set with 8 Octavator CapsThe Boomwhackers C c diatonic set and Octavator caps are preferred by music educators, and is found in thousands of classrooms around the world! This C c diatonic tubes and caps set is the starting point for all of your Boomwhackers activities. Found in most elementary music classrooms and music therapy programs around the world, these affordable, color coded, tuned percussion tubes provide an opportunity for any age and ability to experience success