Koltose by Mash - Craft Rocks are not your ordinary landscaping or gardening rocks. Our stones are hand selected and inspected to ensure it meets our extreme quality standards. Each rock must be flat exceptionally smooth non-porous and the proper size shape and shade for rock painting. Each of the 20 stones is 100% natural unpolished and comes in various shapes and sizes within the 3.5? - 5? inch range which leaves you with a huge surface for rock painting. From inspiring words and kindness stones to pet rocks and mandala stones from pictures and patterns to free-styling and symbols you will find that this set has the perfect paintable rock for your idea.