I use real sinew, period. It shrinks when it dries, which makes for a very strong wrapping. When I wrap stone points onto my arrows it is the best thing to use. I've used artificial sinew, but I just can't get it to hold as tight as real sinew. My stone points will always tend to wobble and work loose when I use artificial sinew, but not so with the real stuff. Also, the wax tends to make it slippery and it will loosen over time. I've tried to pull the artificial stuff real tight when I wrap with it, but it still works itself loose. If I'm making a crap arrow for someone else and they don't care about it, I'll use the fake stuff just cause it's quicker...but it certainly isn't better. For real hunting arrows that will hold up to the abuse of hunting conditions, real sinew is the way to go.