Clayton Pork Knuckle Bottleneck/Slide Large; first-class ceramic bottlenecks, made in USA; heavy, thick-walled models; inside with 12-piece ribbing; allows firm guidance of the slide and prevents annoying sweating if the fit is too tight; length 70mm; outside diameter 33mm; wall thickness 4-6.5mm; inside diameter 18.5mm; weight approx. 113 grams