During the 20th century some soprano trombones—dubbed "slide cornets"—were made as novelties or for use by jazz cornet players, but the instrument has never been widely used. It is easily replaced by the cornet or woodwind instruments and it is difficult to play in tune. Modern Soprano trombone slides are short and often have only six positions rather than seven and built with a bore size of between and a trumpet-sized bell. The soprano trombone's high pitch and narrow, tight embouchure usually prompt bandleaders to assign its playing to a trumpeter, albeit at the risk of detriment to intonation and note selection accuracy if the trumpeter is less than fully familiar with slide work. Modern trombone-players are not keen on the idea of playing Soprano-trombone; the mouthpieces used today are usually trumpet mouthpieces, which also make the instrument sound somewhat like a trumpet.