I dont know why I am doing this since I already know that there is a difference in actual measured weight in grams between tennis strings that have different gauges. I would like to hear from you. This thread is about actual measured differences. Please do not come in here and say it is not practical blah blah. We are not discussing practicality here, or if it so minute in your opinion that is does not matter? or if it is not normal for a player to switch from 15g 1.40mm to a 19g 1.05mm. I have done an experiment in the past with known MRT's on this board and we have proven that EVEN two identical gauge strings have different weight by at least two grams (I feel it is more like 3grams) when one string is Polyester and the other is just a normal synthetic let alone two strings that have extreme gauge differences. Take two identical specd racquet. String one with a thin 1.10mm string and weight the racquet then string the second with a 1.35mm string and weight the racquet. If you do not want to bother with this experiment, justweigh 40 feet of a 15g set of colied string and a 18g set of coiled string. They do not have the same weight and the weight differences will be even more if the composition of the two strings were different, lets say a thick POLy vs a thin synthetic. Exterem difference in tension as well will alter the weight but that is another subject.