Dunlop's Medium Blues Bottle Slide, regular wall thickness. The Blues Bottle slide will take you back to pre-Depression Mississippi, where Blues Masters used medicine-bottle slides to form the roots of modern day blues.
The added density of porcelain provides a tone that is warmer than glass and brighter than brass. The thicker walls provide sustain and a comfortable heft. The Mudslide's silky interior absorbs finger moisture to reduce slipping.