No more broken beer bottle for you, friend. You're so fancy.

From Dunlop: 210 Glass Bottleneck Medium Guitar Slide. Tempered Glass Slides for a warmer, thicker tone accentuating the middle harmonics of your sound. Todays most popular slide.
Processed from high quality Boron Silicate.
Heat treated and annealed to produce a flawless tube.
Slide dimensions are listed in millimeters: J210 Medium 20 x 25 x 60, fits ring size 11.