LOL their made of plastic, and yes they have ballbearings now so they will spin a very long time and allow many tricks to be done in one spin

and yes some do lube the bearings in yoyo's but some also cleans the bearings to where their is no lube, which means no resistance and it spins even faster and longer, but the bearing doesn't last a long time either

i actually have 2 kinds of lube, mine is prob to lightweight and really thin, but the lube that came with my wifes yoyo is more thicker and has the teflon in it