Material : Our polished stones and crystals are selected of the highest quality, so there is no need to worry that they are added chemical and cause your healthy. Our each crystals are 100% real natural, assorted tumbled crystals will have dark and light and size is also different, but it wont affect their inner using and beauty. .Specifications : Total weight approx 1 lb (including package weight ), single healing polished stones weight approx 8-11 g. Please note that our stones are selected high quality and handmade, so some difference in color size and weight, but it will not affect beauty. 10 tumbled stone colors randomly sent. .Functions : Tumbled stones can be used in many ways - lucky stones, vase filler, decorations, ground cover, accents in potted plants, game markers, making jewelry and much more.tumbled stone can clean your negative from your life and surrounding environment. .Healing your life : Tumbled stones provide healing in all areas of your life, and notably in your mind. These stones are even popular among spiritual healers, mindfulness practitioners, and meditation practitioners because of their healing properties when it comes to mental well-being.