rs paris octagon string reelPremium monofilament tennis string reel from Robin Sderling RS PARIS poly is a high performance tennis string developed by Robin Sderling, a product that Robin has spent a long time developing to produce the perfect balance of spin and power. RS PARIS is stiffer than RS LYON, but good enough in terms of stiffness to be a poly string. The octagon profile makes the spin sensational and you get a nice, crisp feel in your strokes and superior durability