I have no clue what it is, but with this clamp I have broken the clamp bolts. I made sure on the second bolt that I wasn't over tightening and it wouldn't hold my seat. I work at a shop and I know of a couple kids that have this problem. I even gave my old one away to a kid and he's broke some of the bolts. It looks cool but, I wouldn't reccomend it.
I don't know how much one can write about a brake lever. But I will say this is the best lever I have ever had. It was crazy how all I did was switch from a dirt harry to this lever and it made my brakes work 5 times better. At $16 it's cheaper about all other "aftermarket" levers. It rules.
I bought my first pair when they first came out, and to this day i ride those bars no problme. Lifetime warrenty, and awsome customer service. Your pretty much buying one pair of awsome light strong bars that will literally last forever.