Devlin's plans traditionally recommended half-oval chafe guards in SS or brass, but my recently revised SG plans recommend a durable wood like purpleheart as a 3/4" addition to the 1.5x3/4" hardwood runner.

After looking at metal costs on my general go-to, onlinemetals.com, I suspect his recommendation has changed due to cost/availability concerns.
I'm interested in recommendations and thoughts from those of you who've built or rebuilt boats with runners - both on materials and on suppliers you've used.
Thanks in advance!

After looking at metal costs on my general go-to, onlinemetals.com, I suspect his recommendation has changed due to cost/availability concerns.
I'm interested in recommendations and thoughts from those of you who've built or rebuilt boats with runners - both on materials and on suppliers you've used.
Thanks in advance!