I read in another thread about someone using a multi in the crosses to reduce swingweight. Well, being a curious individual and the proud owner of a set of digital scales, I decided to put some strings on the scales. Here is what I found out. Let me go ahead and say one thing. I love you guys, but I did not take a set of gut out of its bag. No, I just strung a couple of frames with gut and to get the weight of gut took the empty bag and put it on the scales. I then took the bag with gut in it and subtracted the difference. I also, and get this, took a set of IsoSpeed off the reel it comes on, wieghed it, and put it back on the reel. Finally, I weighed one of those clip things that hold the string together. I tried a couple of different ones, and none of them would register even one gram on my scales. So, I don't take them into account. Now my findings: Natural Gut - Pacific Prime 17 - 1.25 mm - 12.2 m = 19 Grams Volkl PowerFibre 17 - 1.25 mm - 12.2 m = 17 Grams Luxilon ALU 16L - 1.25 mm - 12.2 m = 21 Grams IsoSpeed Professional 17 - 1.2 mm - 12.2 m = 15 grams Pacific Xtreme PolyForce 16L - 1.25mm - 12.2 m = 22 grams Prince Synthetic 16 w/Duraflex - 1.30mm - 12.2m - 20 grams So, from heaviest to lightest: Pacific Xtreme Polyforce 16L - 22 grams Luxilon ALU 16L - 21 grams Prince Synthetic 16 - 20 grams Pacific Prime 17 - 19 grams Volkl PowerFibre 17 - 17 grams IsoSpeed Professional 17 - 15 grams So, if one was using the Mojo set up with gut / IsoSpeed, here's what you would have: 9.5 grams (1/2 set of gut) + 7.5 grams (1/2 set of IsoSpeed) for a total weight of 17 grams. If you took that set up and altered it, ostensibly to reduce the swing weight and used a multi, here's what you'd have: 9.5 grams (1/2 set of gut) + 8.5 grams (1/2 set of PowerFibre) for a total weight of 18 grams! So, if you were trying to reduce swingweight, you really shot yourself in the foot. To quantify: I used those little "O" ring dampeners, the kind you can buy at Lowe's or Home Depot. I weighed one of those. It weighs one gram. That's really not enough difference to make a difference in the swingweight of a frame, IMO. But it is the difference between the above two set ups if anyone wants to "feel" the difference in their hand. By contrast, a dry regular length Tournagrip weighs 5 grams. Take that same Tournagip and let it get soaked with sweat, and the weight goes to 9 grams.