Savarez orginated in 1770 and still produces an extended choice of strings to the various requirements of the musicians today.The red card, yellow card and white card sets orginated in 1946 these strings bring power, clarity,sustain,and longevity thanks to the mastery of the production, and of the nylon special treatments, a material which was then revolutionary. Then there is the Corum/Alliance sets which comes in-normal tension or high tension(500AR, 500AJ).