Features: Efficient oxygenation enhances water circulation and provide a healthy living environment for fish. Durability component, easyly to install, suitable for multiple air pumps model. Suitable for family aquariums enthusiasts, professional breeders, and Aquariums operators. Suitable for various type of fish tanks, aquariums, and ornamental fish breeding pools. Use this essential accessory to enhances the aquariums environment. Specifications: Color:Six Elections Dimension:4cm/1.57in 6cm/2.36in 8cm/3.14in 10cm/3.93in 12cm/4.72in 15cm/5.9in Component:Shape of loose sand sculpture 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.