Add the "black" notes to your Bass Diatonic Scale for more versatility. These durable, lightweight plastic tubes are perfectly tuned to different musical notes, which are clearly marked. Whack almost anything, like a table, a chair, the floor, your leg, the side of your shoe...whatever! Different surfaces produce different "timbres", but always the same musical pitch. Play a tune, tap out rhythmic patterns or ostinato accompaniment, or play along with other instruments. They're always in tune! Whack the tubes together and -boom- you have an interval or a chord! What a "tubular" (very cool) way to explore pitch, rhythm, melody, timbre, harmony, acoustics, and dynamics - just like they do in STOMP! Bass Chromatic - 5 tubes (12" to 50" long).