As far as I've ever heard, it's typically a Thai strain of MJ (may be actually called thai, fucked if I know) that's skewered slightly on a stick (usually bamboo) and tied on with string. When it dries, the buds stick to the bamboo, and there ya go.

As for the particular strain, I'm sure it needs to be outstanding bud to stick to that bamboo skewer, so look for the best. and GOOD LUCK.