Try to find the one that's made in Japan... all black nga sya and around P200+ each. The Taiwan equivalent costs half as much, but may just fall apart after only two days of use, which is what happened to one of mine

I find them useful cuz I park in the open a lot, and my wipers can really get fried that way.

There was a thread about this somewhere else on this site, but I can't seem to find it now.