▎ 摘　　要

NOVELTY - A monofilament string comprises a core comprising single filaments, and a sheath extending around core to contact. The core comprises a material (a) comprising at least a polyamide. The sheath comprises a material (b) comprising at least a polyamide, and 0.1-5 wt.%, preferably 0.1-1 wt.% graphene and graphane nanoparticles. USE - Monofilament string used for racket (claimed) e.g. tennis racket, squash racket, and badminton racket. ADVANTAGE - The monofilament string has excellent durability, and provides comfort to user. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the monofilament string.