In 1999, Songhurst Guitars invented the first ergonomic slide which has been favored by professional acoustic and electric players ever since. The signature is our tapered interior design, which fits like a glove. Other features include the knuckle cutaway for finger flexibility and the dished finger rest for perfect control and vibrato. Polished brass offers the smoothness of chrome with the thick tone of brass. Large Rock Slides® are one of the heaviest on the scene. This makes for killer sustain on the thickest of string gauges and a down-right dark sound. Inside Diameter: 21mm Total Length: 59mm Weight: 100g USA Ring size: 11-12