Tecnifibre NRG2 16 (1.32) Natural Tennis String Pack - 40 feet Tecnifibre NRG2 16 provides players with maximum feel and power. Utilizing their Elastyl fibers, which give 12% more power than standard synthetic string materials, throughout this multifilament strings leads to a more elastic string, giving easy power and a comfortable feel... Size - (See Description) | Color - (See Description) Authorized Tecnifibre Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.