This is a handmade, additive-free product made by simmering natural rosin for a long time. It prevents the sound from flipping over. The rosin is poured into a soft container. The performance is not sticky, but has a smooth feel, while having the characteristic of excellent grip on the strings. Because it is handmade, there may be some overflow, but this does not affect the performance at all. Please give it a try. Thank you for looking.