Viorin violin bow Posted on March 15, 2019May 17, 2019 by j aniano Original 18kt gold and tortoiseshell frog to Viorin violin bow. Owner asked me to make a new ebony frog to allow for easy travel. My replacement 18kt pink gold and ebony frog for Viorin violin bow. The frog is the same height, length and weight of the original. The overall weight of the bow and balance is maintained.