I tried doing a search on this string earlier and couldn't come up with anything other than one reference where a poster was planning to use it. I recently strung a Yonex RDiS 100 Mid (93) with this hybrid and reported it here: PHP: http://tt.tennis-warehouse.com/showthread.php?t=250034 I thought I might provide a more detailed review of the string itself in this forum. My apologies if this has already been covered. My search skills can be sketchy at times. Tough Brid is a hybrid comprised of a 16 gauge poly and slightly smaller diameter (16L ?) textured synthetic (multifilament). It is advertised as providing greater comfort, control, spin, and durability. I played about 3-1/2 hours of doubles today, so I can't really speak to the durability. I'm not a stringbreaker. I put this setup in a RDiS 100 Mid at low tension; poly in the mains at 48 lbs, multi in the crosses at 46 lbs. The hit was very comfortable. I've put polys in the RDiS before, at higher tension, and the feel can be rather board-like. The comfort was appreciated, as the poly used in the Tough Brid is hard and stiff. It may be the stiffest poly that I have used, as compared to others from Gamma, Babolat, Luxillon, and Technifibre. Control was at least adequate. Not as much pocketing as Zo Power, for example, at low tension, but some cupping could be discerned. Control was best maintained by using a long, smooth swing. Sudden acceleration, with the increased dwell time, could result in some minor, but unwanted, deviations from the intended flight path of the ball. For example, I tried to unleash on a one-handed backhand down the line past the netman, but ended up jamming him on the strong-side hip. A winner, all the same, but I was trying to thread the needle. Precision could be problematic. However this could be more a factor of me adjusting to the low tension (I normally string around 60), as opposed to being an effect of the string. Power at low tension was evident. A smooth swing kept the power in harness quite nicely, but too flat of a stroke could easily sail long. Spin was abundant, but I'm not so sure this wasn't more due to the pronounced cupping at low tension as it was the textured cross string. The spin could actually be problematic at times, as it was possible to generate too much spin and not enough depth. My normal groundstrokes are naturally flat, but when I want topspin, I do utilize a more modern stroke, brushing up and across the back of the ball sharply. Again, if I didn't make an effort to smooth out my strokes a bit, spin would often apt to be too much of a good thing. In my experience, textured strings don't usually provide that extreme of an effect and I attribute it mostly to the lower tension, or at least a combination thereof. I didn't find anything especially remarkable about the Tough Brid. At best, I can say it was adequate, behaved mostly as a poly should, and played much softer than expected given the harshness of the poly when stringing. The softness of hit, though, I believe derives almost entirely from the low tension. Feel was one area which I thought suffered with this setup. The RDiS can offer up a rather muted response with a variety of strings, quite unlike its predecessor, the RDS001 Mid. A big part of my ability to obtain "feel" with a racquet comes from the associated auditory cues generated by the contact between ball and strings. The Tough Brid, at low tension in the RDiS, provided a relatively dull sensation at impact. I thought it made touch shots a bit more difficult. It is something I would have to adjust to if I were to pursue this setup in the future. It is quite possible that a tighter setup would be more satisfactory from a performance standpoint. However, I would tend to wager that this would be a very trying and perhaps, painful, experience from the arm's perspective. As always, YMMV. Cheers!