Pros : These worked well with mica powder mixed with Klyr-Fire.
Easy to wash and reuse.
Amazing to actually be able to make easy curves and delicate designs in glass!
Cons : I couldn't get powdered frit with Klyr-Fire to work. This might just be my lack of experience. Not sure.
Other Thoughts : Consistency of mix is probably the key and maybe I haven't figured out the right mix for powdered frit yet.