 The notes range from three octaves below middle C to three and a half octaves above, usually ending on G. The tension of the strings on the soundboard is roughly equal to a ton (10 kilonewtons).The lowest strings are made of copper or steel-wound nylon, the middle-lower of gut, and the middle to highest of nylon, or more or all gut.The pedal harp is identifiable as a large instrument with a straight pillar for support sometimes adorned with a crown at the top; a soundboard, which is pear-shaped with an extended width at the bottom in most harps, while some older pedal harps have soundboards that are straight-sided though widening toward the bottom; a mechanical action made up of over 1,400 parts attached to a harmonically curved neck; and a base with seven pedals that are arranged in the following