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A mooring pennant should be as thick as will fit through your bow chocks. No reason for it to be "flexible". The big issue is chafe. Make sure you use chafing gear where the pennant passes through the chock. The absolute minimum size I would use on a boat your size is 5/8. And forget the snubber - this isn't like a short dockline. You have lots of shock absorption due to the long length of the pennant and mooring chain.The previous owner gave be what he had used for a mooring bridle and the rope on it seems like an over kill, about 1/2 - 3/4 inch thick. Should that be okay or shall I try something a little thinner and a bit more flexible.