The most comfortable and ergonomic metal slides we've ever come across here at Chicago Music Exchange, the Rock Slide is a joy to play and to listen to. The highest mass of the slide materials, brass slides tend to resonate low-mid and mid-range frequencies and are quite a bit warmer in tone than chrome. The large brass slide from The Rock Slide is 2.1cm in inside diameter, with .100 wall thickness, and has a full 6-string coverage.From the manufacturer: Introducing comfort and control. Anyone can grab a hacksaw, cut a piece of pipe, chrome it if they are willing and call it a slide. At RockSlide we are bit more creative utilising technology and a $400000Swiss screw machine to manufacture the mostergonomic slide for the human hand. Designed with a tapered interior to fit snugly on the finger, and prevent wobbling and is cut away at the knuckle to prevent pinching and an adjacent finger rest for added stability. The thick solid brass walls provide unparalleled smooth sustain. Offered in three sizes for the perfect fit in Chrome, Gold and Raw Brass!! The tone is legendary, the look is drop dead gorgeous.