Made of RESONA plastic resin, the innovative Sigo tenor (designed in collaboration with Geri Bollinger and Kunath Blockfloetenbau) is a revolutionary design. Using 3D printing, the bore snakes back and forth the length of the body, meaning that there is more distance between the tone holes on the inside than on the outside. The actual sounding length of the recorder is that of a normal tenor, but the hand spread is about the same as an alto. The body is one piece with a removable head joint and integral thumb-rest. Hole 7 is slightly raised to be more accessible.