Ross Reels Evolution RThe Evolution R is the culmination of our engineers and machinists artistic and technical prowess. It features a fully sealed carbon fiber drag with an industry best power to weight ratio. Encased in a super lightweight frame, all models are less than 5. 2 oz. The innovative shape of the ultra large arbor spool is engineered to force the even winding of the line across the face of the spool as it is retrieved something never before seen in a fly reel.