If your talking about the Triton Rollerbal pen, the Jr Gent II is the same diameter but the Jr Gent II lower tube is longer that the Triton. The upper tube is the same length. I like the look of the longer lower barrel so I typically use a Jr Gent II rather than the Triton tube. I then use a 1/4" dowel spacer ( it think it was about 1/4" long ) to make the standard refill work with the longer tube. The featured picture on the front page of the website is a Triton Pen with a Jr Gent II lower tube. <shameless gloat >:biggrin: