The Glass Bottle Slide is the secret behind the tones of many great slide players past and present. Based on the specifications of a vintage medicine bottle, the unique glass surface and light weight offer excellent tone, sustain, and playability. D'Addario Accessories are known for innovative, problem-solving, quality musical accessories offering a complete line of award-winning accessories including cables, picks, tuners, capos, straps, humidifiers, maintenance tools and more.