Designed and made in the USA, Susato whistles offer exceptional tone, precise pitch, and an extremely stable two octave range. These are great whistles, perfect for all level of player. Crafted of sturdy ABS plastic, these whistles as not affected by changes in temperature or atmosphere, a common occurrence with metal based whistles. Includes a snap in place, adjustable thumbrest. Comes in a nice leather pouch, and with Susato Joint Grease.