The Rocky Mountain Slides Brian Stoltz Signature Model Dual Glaze Guitar Slide has a Salidan Middy length, with a special combination of his favorite 2 glazes, Voodoo Black and Hellhound Red. There"s the added bonus of two raw strips of clay, polished to a lustrous pewter shine and that gives this slide a real "tone to the bone" combo sound.After many prototypes and conversations with Brian, here"s a slide that he is proud to put his name on, and so are Rocky Mountain Slides.This guitar slide has an Inner Diameter of 22-24mm (approx. 7/8").This model is 53-55mm in length (approx. 2").