I just put the last set-type of Pirastros on my Martini to test them. They are the Orig Flex(OFLX) which we have heard are Identical to the Orig Flat Chromes(OFC) except the silk colors. Let me tell you this.... FALSE to my ears and hands. This must be that Liquid insertion I had heard about.. Completly different sounding string that the OFCs. They are all the exact same gauge with the exception of the 'D' string which is .002" thicker on the OFLX. Now for the results and then the comparisons; These (OFLXs) have a nice fat and powerful bottom as compared to the OFCs and Reg Flexs. The 'G' is the only string I don't like but that was the same problem with the OFCs. I changed them one at a time so I can compare them carefully. The 'G' was better and smoother sounding than the OFC 'G' but was still a little too bright for my ears. The OFC 'G' had the same problem on the Gilkes that it did on the Martini so it's not the Bass. The Best 'G' within the 3-sets tested was the Reg Flex. I have the Reg Flexs on the Gilkes now and the Orig Flexs on the Martini. These OFLXs are softer as well in thumb position than the other 2 sets with the exception of the 'G'. The only problem I had with the Reg Flex set was the 'E' being a little flabby on the Martini but I don't have that problem with the Gilkes. I tested all 3 of these on the Martini but I didn't test this last set (OFLX) on the Gilkes. I did a Jazz Trio/Quartet Rehearsal yesterday with the Gilkes and the Flexs and it sounded great. No problem with the 'E' there BUT the OFCs were better for Jazz than the Flexs were on that Bass. Finale..all 3 sets were great for Pizz but the 'E' Flex was a bit Flabby on the Martini (only) and the 'G' from both Orig Sets are a bit out of balance. The OFLX is a bit better than the OFC but the Reg Flex 'G' wins every time with every set on every Bass.