carbonfiber or peel ply carbonfiber (none of that laminated crap). with metal where the pivot is obviously.
zero liners preferred if it can be helped. but a thick layer of milled out titanium can help. thin stamped ti like say a boker exkelaber is bad.
if i could get every knife to have carbon fiber on both sides that would be idea, liner lock or frame lock (obviously it would have to have a metal/titanium bar attached for the either of the locking interfaces).
some examples
Burger Knives, EXK1
Jerry Moen blue max
Guardian Tactical Helix
same for fixed blades. carbon fiber all day long.
