Rosin Violin strings Natural Rosin for violin viola cello bass bow (2 Pack Rosin) Handmade soft rosin.Designed for violin, viola, cello Rosin is Great grip and sound penetrating, make the instrument pronunciation sensitive and timbre Natural rosin low dust ,protect human body against the harm. 30-DAY MONEY BACK GUARANTEE ---If in the next 30-day your rosin stops performing well, return it for a full refund no questions asked! Rosin Wooden box packaging is best gift for music lovers or friend.