I bought the mixed rock thats part of the package and I bought 50lbs.
They are smashers but thats all I know.
They were pretty easy to catch, I just watched the rocks for a day or two until I could see where they went.
Then I pulled the rock and squirted RO water in the hole that they went into and they shot of of there like I lit a match under their butts.
Two of them were about 2" long and one was really small, probably 1/2"