MIne Measured ...
Chip: I measured mine for you. It was about 63 feet long, and about 7/16 in diameter. This diameter is probably more than necessary for strength, but for the feel in your hands of the bigger diameter is nice. Mine is the original sheet that came with my boat, and line has improved greatly in the last 20 years, so a lesser diameter may be acceptable. A previous response mentioned Sta-Set-X. I don't have my catalog here, but I know I buy Stay-Set lines from West Marine, and some are for sheets, and some for halyards. Buy what they recommend. I did, however, buy one one time that was too stiff, and unacceptable for a halyard, and had to return it. Aldo