GOSEN TS153NA:SET Polylon Tennis Strings 17g 1.24mm Natural The Gosen Polylon Tennis Strings 17g 1.24mm Natural POLYLON TENNIS STRINGS 17G/1.24MM NATURA... Tension Maintenance | Feel | Playability Size - (See Description) | Color - (Natural) Authorized Gosen Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.