I just asked this about a month or so ago, when I changed my mono's over to the JCW 3 leafs.
Long story short... everywhere I looked, it was the same. I was confused because I found places on Ebay selling them for mono and multi. However, I think they write the description that way to come up on search results.
I know of no difference. The eye diameter is the same on the mono and JCW 3 leafs, I do know that.
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