I have recently started to measure the diameter of my strings with a digital caliper when strung at my usual lower 50 pound tension with constant pull in 100 square inch Prince Graphite Longbody's and found some surprising results. No wonder I was having trouble comparing Prince Premier Softflex to other multi's! Here's the data in order of string type and gage, listed diameter in mm, measured diameter when strung. Prince Premier Softflex 17, 1.25, 1.18 Prince Premier Softflex 16, 1.30, 1.25 Tecnifibre NRG2 17, 1.24, 1.23 Forten Sweet Natural 17, 1.20, 1.24 Forten Sweet Natural 16, 1.30, 1.27 Forten Sweet White 16, 1.30, 1.30 The Softflex stretches so much that it plays one gage smaller than listed. The Sweet 17 is much thicker than the 1.20 mm diameter listed. The Sweet 16 natural color is smaller diameter than the white color and plays a bit better in my opinion.