New Kirschbaum multifilament string: Gut Feeling The 'Gut Feeling' is Kirschbaum's latest high-end synthetic multifilament string. Here freshly strung in 1.25 mm gauge in a brand new Yonex EZone Xi 100 racquet: http://oi39.tinypic.com/dwrrkk.jpg http://oi44.tinypic.com/zwjc7b.jpg I am not sure how new the string is, since the earliest review I was able to find dates back to December 2012, but the string does not seem to be available on the North American market yet. There is no mention of it on the Kirschbaum USA website. Kirschbaum describes it as their newest development for players seeking the highest level of comfort and maximum feel and arm protection. The multifilament core is said to provide gut-like playability. I am not able to verify the last claim since I have never tried natural gut, but based on my initial impressions I can say the string delivers what it promises: a very comfortable and soft feel. According to the product description, the core consists of 1400 high-grade polyamid multi-filament fibres. The string also undergoes "plasma treatment and thermosetting" for improved durability and tension maintenance. Like all other Kirschbaum strings, the Gut Feeling comes factory pre-stretched. It's available in two gauges: 1.25 mm and 1.30 mm and only natural color. Side note: This is the first Kirschbaum string I have ever tried. More in-depth review coming tomorrow night.