Prototype of Low C Bass we recently developed and tested. The pictures display some of the new features most notably the roller mechanism on the thumb keys. This is a full featured Low C with a double register key, nickel plating, with numerous adjustment screws built into the mechanism. If you have any questions about the Bass please feel free to ask.The item "Ridenour Low C Bass, prototype" is in sale since Friday, August 13, 2021. This item is in the category "Musical Instruments & Gear\Wind & Woodwind\Band & Orchestral\Clarinets". The seller is "rclarinetproducts" and is located in Duncanville, Texas. This item can be shipped worldwide.