Gambus (Arabian Oud) is a stringed instrument like a guitar with a body shaped like a pear sliced in half. It has 12 nylon strings and are plucked, much like a guitar to generate sound, with a plastic plectrum. However, unlike a guitar, the gambus has no frets. The classical guitar typically has 3 nylon and 3 nickel-wound strings. ... Species Pyrus calleryana P. pyrifolia et al Pears are trees of the genus Pyrus and the edible fruit of that tree. ... Nylon is a synthetic polymer, a plastic, invented on February 28, 1935 by Wallace Carothers at DuPont of Wilmington, Delaware, USA. The material was announced in 1938 and the first nylon products; a nylon bristle toothbrush made with nylon yarn (went on sale on February 24, 1938) and more famously... A plectrum (plural: plectra) is a device for plucking or strumming a stringed instrument. ... The neck of a steel-string acoustic guitar showing the first four frets. ...