Not sure what else I can say other than what’s on the product page on our website. I guess I could tell you that I put one in our PTM5 Mallet, as did Pete (designer of the PTM5 head), and the results are amazing. It is well documented that a heavier overall mass in a putter, distributed throughout the entire putter and balanced properly, will produce smoother, more consistent strokes. We were able to develop the shaft out of high grade aluminum and make to a weight that accomplished what we wanted in the overall weight distribution. Combined with our putter head weights in the 360-390 gram range, the results greatly exceeded our expectations, both in the feel and in the roll consistency. Can’t wait to get on the course this spring and summer with it.