Blues sensation Gary Clark Jr has breathed new life into one of American richest musical traditional. he uses Dunlop glass slides to electrify his groovy licks with a thick, accentuated midrange harmonics. The Gary Clark Jr glass slide, like all Dunlop glass slides, is made from high quality BORON silicate that's been heat-treated and annealed to create a flawless tube. It features a heavy wall thickness and small diameter.