Natural stone XF40112 DRAGON ROCK for aquariums and terrariums, 100% natural stoneMixed Size: Range from10-20cm /20-30cm. Dragon stone does not alter the water valuesSafe and great looking rocks for your aquarium, ideal for planted tankGreat for anchoring plants and mosses, creating hiding places for shrimp and small fishDragon stones are clay-like, a quick-wash is necessary before placing them in your aquarium.Sizes: 10-20cm/20-30cm.