Solinco Heaven Polyfire is a high end Co-Polyester Monofilament is made of a Du Pont high modulus polyamide.It offers a good feel and provices exellent control besides being arm friendly. It is a great choice for a player looking for good playability and lively feel. It is for comfort use and softened the overal feel without sacrificing the control and spin that players want. Made from monofilament polyamide, it has a gauge of 130 mm and a length of 12 mm.