Ultra-comfortable Amber Glass Slide The Amber Glass Slide from The Rock Slide is an ultra-comfortable guitar slide with an ergonomic finger rest and a knuckle-relief cut that fits like an absolute glove. The 4-millimeter-thick wall at the slide's opening transitions to a 7-millimeter-thick wall at the fingertip for incredible tone and sustain, giving you options up and down the slide for subtle tone colorings. This is a favorite slide among guitarists here at GearNuts.The Rock Slide Amber Glass Slide Features: Ultra-comfortable glass guitar slide Ergonomic finger rest and knuckle-relief cut Tapered interior for subtle tone-coloring options