The flared sides of the Dunlop 234 glass slide offer better string contact and more control for radiused necks. Perfect for open tunings where you want several strings ringing at once. The tempered glass of this slide provides a warm, thick tone that accentuates middle harmonics. 20 x 25 x 69mm / .79 x .98 x 2.72". Fits ring sizes 10-11.