I'm a big fan of props which use the m.f.f. principle and had been at a screeching halt due to my
special marker drying up and eventually vanishing completely. I purchased these just on a chance,
hoping they're gimmicked that way. Sure enough, they are and very good markers to boot. If you're in
the predicament I was in, these are a great deal. Menny's a cool guy, like to meet him some day.