Add some bass to your boom! This set of seven longer tubes produces the C Major Bass Diatonic Scale. This is a great addition to the basic set. Let your students explore the relationship between length and frequency. With the two sets, students discover that a long open tube produces the same frequency as a tube half the length with an end cap. The tubes in this set range in size from 24-48 inches. Together the Bass set and the Basic set form a continuous scale. Great for teaching about sound, frequency, and nodes. Note: Bulky item. Higher shipping rates may apply for international and express orders.