I lied. I might take out these rocks. I found cooler looking rock at a local rock shop, Buschelman's (for Cincinnatians). There were some gorgeous rocks, like ADA, rock garden type rocks but they have to be a least a ton. I wish I can take a chisel and hammer to them. I can only grab what I can out of a bin which was pretty darn hard (fingers not smashed). I managed to grab 100lbs of rocks. Not sure what type they are.