LX6 = inner diameter + .639" or 16.25mm
The LX Model is the shallowest in the Studio Master LX Series. These models are shortened down in overall length to reduce the amount of resistance they offer in a manner different than most lead pieces. The #27 bore (.144 or 3.65mm) is also more open than many lead pieces. In this way the LX is unique, offering a shallow cup while combining other resistance control features that make this model truly versatile offering a massive sound with lots of playability throughout the entire range, low to high.