Designed by Paul Wertico, Promark TUBZ are hollow plastic tubes that resonate at their own frequency when used to play another surface. These unique alternative sound sources are great on drum set, hand drums and auxiliary percussion. Hollow plastic tubes Durable material can withstand rimshots and heavier playing Resonate at their own fundament frequency Unique sound on any type of drum All Promark drumsticks are designed, engineered, and manufactured in the USA at our Texas facility to the most stringent quality controls in the industry