The Best Brass Warm-up nano is a practice accessory for brass players that can be used in two primary ways: to allow for silent buzzing practice by inserting the mouthpiece directly into it, and to transform a standard "Wah-Wah" mute into a practice mute by inserting it into the mute. Its "astoundingly small" size makes it highly portable. The nano features an internal design with acoustic considerations for generating appropriate resistance, facilitating a natural lip vibration, and is also designed to be worn as an accessory.