are made almost entirely of wood. The shell (Tekne) is assembled from strips of hardwood called ribs joined edge to edge to form a semi-spherical body for the instrument. The number of ribs traditionally amounts to 17, 21 or 23, yet tanburs with slightly wider and consequently fewer ribs (7, 9 or 11) can also be found among older specimens. Traditionally, thinner strips called fileto are inserted between the ribs for ornamental purposes, but are not obligatory. The most common tonewood veneers used for rib-making are mahogany, flame maple, Persian walnut, Mecca balsamCommiphora gileadensis), Spanish chestnut, Greek juniper, mulberry, Oriental plane, Indian rosewood and apricot. Ribs are assembled on the bottom wedge (tail) and the heel on which the fingerboard is mounted. wood.The soundboard (Gö?üs) is a rotund thin (2.5-3 mm) flat three-, two- or single-piece plate of resonant wood (usually Nordmann, silver or Greek fir). This circular plate measuring about 30 to 35 cm in diameter is mounted on the bottom wedge and the heel with simmering glue and encircled with a wooden ring. A soundhole is either wanting or consists of a very small unornamented opening (mostly in historical specimens), giving the instrument its peculiar satiated sonority.
The neck (Sap) is a mince (only 4-4.5 cm in diameter) 100-110 cm long D-section fingerboard made of light wood and carries catgut frets adjusted to give 36 intervals in an octave. Catgut frets are fixed on the neck by means of minute nails. The main bridge is trapezoidal and mobile, and since the shell lacks braces to support the soundboard, the latter slightly yields in under the bridge. The smaller upper bridge between the pegbox and the neck is traditionally made of bone. The plectrum is made of tortoise shell and is called "ba?a" (meaning turtle). Cut in an asymmetrical V-form and polished at 45° on the tip, it measures 2-2.5 mm x 5-6 mm x10-15 cm. Nowadays it has seven strings. In the past tanburs with eight strings were not uncommon.
The yayl? tanbur is a bowed lute from Turkey. Derived from the older plucked tanbur, it has a long, fretted neck and a round metal or wooden soundbox which is often covered on the playing end with a skin or acrylic head similar to that of a banjo. The instrument is held vertically, with the soundbox resting in the player's lap.from the wikipedia