The NEW Musical String Co. 912 Super-Sensitive Dark Rosin is a high-quality guitar accessory designed for musicians looking for exceptional performance. Made by the reputable brand Musical String Co., this model offers super-sensitive dark rosin that provides a rich and vibrant sound for guitars and basses. Perfect for guitarists and bassists seeking precision and clarity in their musical experience, this product is a must-have for enhancing your instrument's tone and responsiveness.