Well I prepared one of the free bricks that I received for complaining about finding pea sized stones in a batch of bricks I purchased and much to my dismay I was stabbed repeatedly in both my hands while trying to grind it up into a fine loose state. Didn't even look to see if it had more stones but instead the fibrous hair like pieces of fiber within were a little larger and were hard like splinters. I did find a couple of wood chips in it. I was once again angered by what I found and the fact that I know if it was irritating my hands then those fibers were definetly going to irritate my frogs skin not to mention may put them at risk of losing an eye. I imediately threw it out and started another brick. Ill probably have to complain again. I didn't actually lose money on it because it was sent to me for free but its the fact that it basically was loaded with thousands of spines.