vibrates, its length changes slightly as one edge moves along the rounded bridge, promoting the creation of overtones and giving the sound its distinctive tone. The maintenance of this specific tone by shaping the bridge is called jawari. Many musicians rely on instrument makers to adjust this. Materials used in construction include teak wood or tun wood (Cedrela toona), which is a variation of mahogany, for the neck and faceplate (tabli), and calabash gourds for the resonating chambers. The instrument's bridges are made of deer horn, ebony, or very occasionally from camel bone. Synthetic material is now common as well. Construction styles There are two popular modern styles of sitar: the fully decorated "instrumental style" (sometimes called the "Ravi Shankar style") and the "gayaki" style (sometimes called the "Vilayat Khan" style). The instrumental style sitar is most often made of seasoned toon wood, but sometimes made of Burma teak. It is often fitted with a second resonator, a small tumba (pumpkin or pumpkin-like wood replica) on the neck. This style is usually fully decorated, with floral or grape carvings and celluloid inlays with colored (often brown or red) and black floral or arabesque patterns. It typically has 13 sympathetic strings. It is said that the best Burma teak sitars are made from teak that has been seasoned for generations. Therefore, instrument builders look for old Burma teak that was used in old colonial-style villas as whole trunk columns for their special sitar constructions. The sources of very old seasoned wood are a highly guarded trade secret and sometimes a mystery. There are various additional sub-styles and cross mixes of styles in sitars, according to customer preferences. Most importantly, there are some differences in preferences for the positioning of sympathetic (taraf) string pegs (see photo). Amongst all sitar styles, there are student styles, beginner models, semi-pro styles, pro-models, master models, and so on. Prices are often determined by the manufacturer's name and not by looks alone or materials used. Some sitars by certain manufacturers fetch very high collectible prices. Most notable are older Rikhi Ram (Delhi) and older Hiren Roy (Kolkata) sitars, depending upon which master built the instrument. Nikhil Banerjee had a small extra bridge fixed at the top of the Sitar fingerboard for sustenance of sound. Tuning of sitar Tuning depends on the sitarist's school or style, tradition and each artist's personal preference. The main playing string is almost