Audubon bird call with rosin. When twisted, this remarkable birchwood and metal instrument makes a variety of sounds similar to wild birds. Each bird call is handmade and individually tuned. Be sure to keep the instrument dry; a small amount of the included powdered rosin, used occasionally, will renew the bird call's voice. Total length approximately 2-1/2" x 3/4" wide.
Adam BStaff:"Rosin is a translucent yellowish to dark brown resin derived from the stumps or sap of various pine trees and used to increase sliding friction, as on the bows of certain stringed instruments, and to manufacture a wide variety of products including varnishes, inks, linoleum, adhesives, and soldering compounds."http://www.thefreedictionary.com/rosinJul 24, 2013