Signum Pro-Plasma 17G 1.23 Strings-(4013001004805) The Signum Pro Signum Pro Plasma 17G 1.23 Strings Pro Plasma is a breakthrough of plasma technology that enhances the comfort and gut-like elasticity. Pro Plasma is made from a material with new molecular structure proving substantial elasticity with excellent tension holding, and durability. Players will enjoy the benefits of this arm-friendly powerful Polyester string.... Power | Control | Spin Size - (See Description) | Color - (See Description) Authorized Signum Pro Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.