The lowest concert pitch depends on the transposition of the device 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 clinical 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 most of the tube with an inner bore diameter among 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 higher and lower joint. The reduction is 1 to 3 millimetres 0. 039 to 0. 118 in depending on the maker.