Silver-mounted violin bow with faux tortoiseshell frog Posted on March 20, 2019May 17, 2019 by j aniano Violin Bow with a round pernambuco stick, silver-mounted Faux Tortoiseshell frog with Parisian eyes and divided button. The faux tortoiseshell material is laminated from a casein-based polymer. The tongue region within the ferrule is reinforced with fiberglass. Personal model inspired by Pajeot. Violin Bow with a round pernambuco stick, silver-mounted Faux Tortoiseshell frog with Parisian eyes and divided button. The faux tortoiseshell material is laminated from a casein-based polymer. The tongue region within the ferrule is reinforced with fiberglass. Personal model inspired by Pajeot.