I bought some of this from **** - same as item number 3683378256. The five sets arrived the other day in individual sealed clear plastic bags and looked like no gut I'd ever seen before. The string consists of what looks like darkish fibres wrapped in a plastic gold/yellow sheath. The seller says the string sets are not in their usual printed packets because they are 'factory rejects' (cut to wrong length only) and Babolat just wanted rid of them. There is no tag or packaging to indicate exactly what they are. I can't find any info on Babolat natural gut string like this - with a gold/yellow plastic or 'silicone' sheath. Is this something new? Has anyone seen this kind of Babolat natural gut before?