The chanter stock is 60mm long (39mm of this inserts into a bag neck and this insert is 27mm in diameter). It has a conical bore starting at 12mm and narrowing to 10mm. Weight 0.04 kg
The bag stock comes in two pieces, 127mm long when put together. The base piece has a circular groove that helps keep the bag stock in position when tied in. The bore is 10mm wide. Inside is a leather flap non-return valve. Weight 0.055kg. NB: This bag stock is designed to match the NPU made flexible bellows connector - not included (sold separately or comes with every new bellows). Alternatively it will fit any flexible connector with an inside diameter between 15.5mm and 19mm.