Black Mountain, Medium Gauge Thumb Picks Patented spring-loaded, tapered thumb clasp allows beginners and experts alike to easily explore multiple picking styles like thumb, hybrid, and flatpicking with one pick. Self-adjusting fit is comfortable for medium, large, and extra-large thumbs. Beveled leading edge provides extra speed and control at the point of contact.  Not just for guitar! Great for bass, mandolin, and other stringed instruments.