| abstract |
(57) [Summary] [Structure] A core in which the surface of a thermoplastic resin core yarn (a) is covered by swirling a plurality of vinylidene fluoride resin filaments having a diameter smaller than the diameter of the core yarn. Sheath structure resin string. [Effect] The string of the core-sheath structure of the present invention has a small influence of moisture and a small slack, and when it is used as a gut, it has excellent repulsive force, does not feel a change in shot feeling, and has excellent hitting performance. . |