"He who marches out of step hears another drum." ~ Ken Kesey
I'm using the ones from xenon, freakin awesome! Especially with discharge.
Or you can get them from Silkscreeningsupplies.com, that's where we bought ours. I think Ryan Moor had as well some good info on how to use them on his website.http://www.silkscreeningsupplies.com/product/SQBSJT-16There is a lot of information under the above link.