Choose Dunlop metallic slides for a clean, bright, cutting tone with great sustain. Dunlops Brass slides have been chosen for years for their bright resonant tones and comfortable weights. The Dunlop 223 is a medium knuckle, medium wall thickness brass slide that fits the ring size 9 with the dimensions of 19 x 22 x 28.**Slide dimensions are listed in millimeters as: (inside diameter) x (outside diameter) x (length).