Psaltery Bow Roosebeck Psaltery Bow. Made of Solid sheesham wood with synthetic-hairs. The Psaltery Bow must be rosined before it can play the strings. Rosin for bow is sold separately. Broken or loose hairs are not uncommon and will not affect the playing characteristics of the bow. If a hair breaks do not to pluck it out. Carefully cut the hair, leaving a little bit at both ends.