Tecnifibre Razor Code 16g/1.30mm Tennis String is co-polyester string designed to provide them benefits of a traditional polyester string with a slightly softer more comfortable feel to it. You get the spin potential and control of a polyester string but with a bit more feel and touch. Compared to a traditional polyester string Razor Code also provides more power. For the advanced player Tecnifibre Razor Code could be used in a full string bed. It would also make for a main string in a hybrid setup with the crosses being a softer multifilament or natural gut string.