Much More Than the Average Slide The Aged Brass Rock Slide is designed and carefully crafted with your needs as a player taken into careful consideration. The Rock Slide is simply unmatched in comfort, thanks to the design's contoured finger rest and knuckle cutaway. And the slide's tapered interior ensures a uniform fit along your whole finger, adding stability and control to your slide performances. The slide's aged brass material is legendary for its gritty feel and cutting sustain, making your passages jump out.Aged Brass The Aged Brass Rock Slide is the one that started it all with the look of a well-worn tool. Brass imparts your tone with a cutting sound. And the rough surface of the aged brass adds a bit of drag and grit while traveling across the strings. The fact that it is also denser than glass and adds great sustain makes it a popular choice