The instrument is twice as long as the bassoon, curves around on itself twice and, due to its weight and shape, is supported by an endpin rather than a seat strap. Additional support is sometimes provided by a strap around the player's neck. A wider hand position is also required, as the primary finger keys are widely spaced. The contrabassoon has a water key to expel condensation and a tuning slide for gross pitch adjustments. The instrument comes in a few pieces (plus bocal); some models cannot be disassembled without a screwdriver. Sometimes, the bell can be detached, and instruments with a low A extension often come in two parts.