We use generally use Technora spliced to double braid for halyards. One of the better places to talk to about sizes is Layline in North Carolina. One of the guys there (Walt) actually has a J/30. Their ph# is 800-542-5463. www.layline.com

Another good place may be APS in Annapolis (www.apsltd.com)

Dennis Bartley
Planxty, s/n 23994
hull 205