Well, if you've ever ordered a shrimp salad for yourself and it has small whole shrimp in it, that's about the size. These would be slightly bigger then an adult mans thumbnail. They almost look good enough to nibble on yourself I think as a crunchy treat.....(They're at least as big as those crickets in the jar at the left)
As for the other worms and crickets there, visit
http://www.flukerfarms.com/index.asp?PageAction=VIEWPROD&ProdID=33
located in Louisianna, USA but sold at many Pet outlets here.
(I'll ship to you remember, strictly at cost. Just ask..)