How To Climb With Shuko And Ashiko What Makes Something A "metal Knuckle"?

What makes something a "metal knuckle"? - how to climb with shuko and ashiko

I know it sounds like a strange question, but bare with me. I bought a pair Shuker (ninja climbing claws), while in my university in Arizona. I intend to be back to San Diego in the summer, that where I am, and I wanted to ensure that the reuse of these products are not considered to be illegal. So that California looks like, I could ban a word, Shuko, but I saw that their compounds are prohibited. So what you really want to know is if Shuko Knuckle than a metal?

Here is a link to what looks like Shuko, and how they are used when:
http://doorcountyart.homestead.com/files/shuko_claws.jpg
http://www.shadowofleaves.com/claws.JPG