I used to carry the Grabit Stix here at the shop, and it seemed like the end was some sort of wax like substance. I haven't had any in stock for awhile, so maybe they changed them a bit.
They worked, but I found out the hard way that once you get paint on them, they are pretty much useless. But again, those were the ones I had before...which seemed almost like bees wax or something on the end. If these ones you got are actually something like silicon, that would be even better.