This Dunlop 203 glass slide provides a warm, thick tone that accentuates the middle harmonics of your sound, featuring regular wall thickness and a large diameter. Processed from high quality boron silicate. Heat treated and annealed for a flawless tube. Regular Wall Thickness - Large Diameter. 22 x 25 x 69mm / .87 x .98 x 2.72". Fits ring sizes 12-13.