This instrument is quilled with crow quill, the most common material used for plectra at that time.
plectra of leather were also in use, as well as those of quill.
The plectra nearest the keyboard points the same way whether the jack is upside down or not.
Each of these jacks has two plectra, one pointing to the right and one to the left.
The direction in which the plectra of each row of jacks should be pointing is not known.
In the clavicytherium at the Smithsonian Institution the plectra nearest the keyboard points to the player's left.
something used to pluck the strings of a musical instrument, 1620s, from Latin plectrum, from Greek plektron "thing to strike with" (pick for a lyre, cock's spur, spear point, etc.), from plek-, root of plessein "to strike" (see plague (n.)).