Bowmaster is a teaching aid to assist beginners in developing the proper bow grip. Made of pliable rubber that slides onto the bow. Simply unscrew the screw on your bow all the way to remove the frog from the stick and slide the bowmaster grip onto the bow. Re-connect the frog and tighten the screw, and you're good to go.
Manufactured to fit different sized hands, but select grip size based on your bow size.
9480 Large (designed for 3/4 and 4/4 size instruments)
9482 Medium (designed for 1/4 and 1/2 size instruments)
9484 Small (designed for 1/16" and 1/8" size bows instruments)