Over 3 lbs of rocks for your rock painting activity. I will fill a small flat rate USPS box with rocks (Plus a little padding so they don't slide around a lot) There are at least 12 rocks in this box with the possibility of more depending on the size. Rock shape and size will vary. Most rocks are approx 1-2 inches long. All rocks will have one coat of white primer on them. This helps the paint stick to the rock and makes a more vibrant color when painted.