Dunlop 210 Tempered Glass Slide, Medium Wall Thickness, Medium Accentuates the middle harmonics of your sound Processed from high-quality boron silicate Heat treated and annealed Medium, fits ring size 11 Medium with heavy wall fits ring size 10-1/2 Large fits ring size 14 Accentuates the middle harmonics of your sound Heat treated and annealed Medium, fits ring size 11 Medium with heavy wall fits ring size 10-1/2 Large fits ring size 14