Wooden bow with nylon for the psaltery. Rosin for bow (VR200 D'Addario Rosin) sold separately. Never handle the hair of the bow with your hands. Oils from your skin will be absorbed by the bow hairs and leave permanent slick spots on the hair. The bow hair, whether it is made of real horsehair or synthetic fibers, will be slick. In order to grab the strings it will need to be coated with rosin.