The sub-contrabass recorder is a member of the recorder family with a low note of FF (or F1 in SPN).
[citation needed] It is manufactured in a design with a square or rectangular cross-section, which was first patented in 1975 by Joachim and Herbert Paetzold.
They are made from plywood and have a doubled-back bore like a bassoon, which reduces the exterior length of the instrument.
[1] Through this special and proprietary design, the instrument can be played with a very short bocal.
This article relating to recorders is a stub.