Spent the weekend Kayaking on Cherrry Lake near Yosemite. Chopped a lot of hardened oak and Manzanita washed up on shore. Didn't notice it at the time but ended up with a lot of scratches on my new WWII and 20" AK. Hindsight always being 20/20, I guess it would be very hard for the surface of any driftwood not to be loaded with tiny silica particles just waiting to mar a blade with a beautiful mirror polish. I plan on posting a review on them later this week.