The lowest concert pitch is dependent upon the transposition of the tool in query. Nearly all soprano and piccolo clarinets have keywork allowing them to play the E below middle C as their lowest written note in medical pitch notation that sounds D3 on a soprano clarinet or C4, i. e. Modern professional best bass clarinets commonly have extra keywork to written C3. The bore is cylindrical for many of the tube with an inner bore diameter between 14 and 15. 5 millimetres 0. 55 and 0. 61 in, but there is a subtle hourglass shape, with the thinnest part below the junction between the upper and lower joint. The reduction is 1 to 3 millimetres 0. 039 to 0. 118 in depending on the maker.