I think it's just black tape but, no, i don't think so. You can lose as much flesh and blood as you like in the name of style but you generally only make that ethical point once. You're not going to get any sympathy. So now that you're sensibly going to tape something to the back of your hand it might as well have friction (or indulge a rubber fetish). Maybe it's like martial arts - he's got a black belt in roof crack climbing. Check his beard out!