Features: Efficient oxygenation promotes water circulation and enhances the health of environment. Consist of good-quality ceramic component, durability and not easily broken. Compacts and suitable for various aquariums. Suitable for aquariums enthusiasts, aquariums operators, and beginners in fish farming. Suitable for various environment such as home aquariums, office viewing tanks, and professional aquariums. Specifications: Color:Three Elections Dimension:5×1.6cm/1.96×0.62in 10×1.7cm/3.93×0.66in 13×1.7cm/5.11×0.66in Component:ABS, sand Package Includes: 1pc Aquariums Air Stone note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.