Possible Clues:

• Tough string for violin or tennis racket
• Tom Thumb reportedly is strung out to music
• Tough string for stitches and musical instruments
• Tennis racket string material, once
• Material use for musical strings, made from intestines of sheep or horses (but not cats)
• Strong cord from California that gaffer uses temporarily at first
• Tom Thumb, it's said, might be strung out and enmeshed in a racket
• Onetime material for tennis racket strings
• Racket material
• Material used for violin strings, for example