Bow Rosin Colophony Greek Pitch Friction-increasing Resin for Violin Viola Cello Bowed String Instrument This little rosin can increase friction of bow hair and make them speak so that it is a good helper to better your performance. As a saying goes, a handy tool makes a handy man. This gadget will deserve your try! Bow Rosin Colophony Greek Pitch Friction-increasing Resin for Violin Viola Cello Bowed String Instrument: Small in size, stored in a box for ease of use and transport.Applied to bow hair to increase friction.Grip the hair and make them speak, or vibrate clearly, better performance. Specifications: Material: Resin Package weight: 22g / 0.8oz Package size: 19.5 * 13 * 1.5cm / 7.7 * 5.1 * 0.6in Product size: 4.5 * 2.5 * 1cm / 1.8 * 1 * 0.4in Note: The rosin color may not same as the pictures showed because of different seasons. Package List: 1 * Rosin Small in size, stored in a box for ease of use and transport. Applied to bow hair to increase friction. Grip the hair and make them speak, or vibrate clearly, better performance.