Description These small volcanic stones are especially helpful in improving the living environment. The volcanic rocks set can be used for fish tank and aquariums to offer fish a comfortable living environment and simple colors design can improve the visual enjoyment. Features -Color:Black -Material:Volcanic rock -Size:3.50X3.50X2.50cm/1.38X1.38X0.98in -Note:there are different sizes, about 2-4cm - Made of volcanic material, the surface is natural, practical for handicraft DIY project or home decorations. - Great for aquarium, lawn, walkways, fountains, vase fillers, potted plants, craft projects and more. - Nice natural volcanic stones for succulents, other plants bedding, including the water culture plants. - Beautiful and natural stone, proper size and thickness, high hardness, practical and durable for use. - Safe for aquatic fish and suitable for both fresh and salt water environment.Package list: 1 x Pack of Volcanic Rocks (300g/pack)