Dunlop Manufacturing, Inc. was founded as a small, family-owned and operated company in 1965, and has since grown to be a leading manufacturer of electronic effects, picks, capos, slides, strings and other musical instrument accessories. The Blues Bottle Slide will take you back to pre- Depression Mississippi, where Blues Masters used medicine-bottle slides to form the roots of modern-day blues. Blues Bottle Slides are individually hand-blown of durable, seamless glass for a crisp, bright tone. The weighted, closed ends provide optimum balance.