Welcome JT. What kind of specs are you looking for. I run 3/8 line for my jib & main sheets and also for my line sections of the halyards. You could probably go less diameter with some of the high tech lines out there, but I don't like the feel of anything less than 3/8.
What other information can I give you?
Rehoboth Bay/Indian River, DE
S/Y KJ, Helms 25