Originally Posted by
DaveW
Not hard enough for tools!!
I had the same hones, but not marked blue sun. Given where they're coming from, they could've changed a little bit, but mine were a bit powdery. They'd have been decent hones for razors, but shapton pros directly from japan (kuromaku's) are not that far from them in price.
I ended up round filing my stones because I just didn't have time to figure out where I could use them.
(if they're harder now than mine were, that would be a good thing - they were branded UUsharp when I got mine).