Shroud rollers
Attached is a photo of the shroud rollers made in Ipe, a very hard, strong, weather resistant wood popular for decking. They are made in halves, ~7/8" OD with a ~5/16" ID groove for the shroud that is just shy of 1/4".
I wanted them for protecting the genoa from chafe which they do very well. The standard ones are Ash 1-3/8" OD but I wanted less windage & a smaller profile for my mid 80's Pearson.
I've been using ~4 years & like them alot. It doesn't hurt owning a molding & lumber business if you want to custom make your own shroud rollers but they could be done with a router and a bunch of patience.