These black river rocks are 1 to 2 inches in size and weigh about 15 lbs, coming in oval, round, and irregular shapes with unique natural textures. Crafted from natural rain flower stones, they’re durable, harmless, and safe for both plant care and decor. Finely polished to a smooth finish without sharp edges, they’re easy to handle and gentle on plants. They offer dual benefits: placing them on top retains soil moisture and stops weeds, while using them at the bottom improves drainage to prevent root rot. Suitable for aquariums, garden accents, plant displays, and outdoor landscapes, they blend well with any environment. Note: Rinse before use, especially for aquariums, as they may have dust.