Features: Create a smoothing water flowing and reduce noise, ensuring a peaceful environment for both fish and enthusiasts. With a unique rotatable designing, maintaining a clean aquarium. For home aquarium hobbyists want a better and efficient tool, as well as professional aquarists want to improve the health and happiness of their fishtank. Perfect for use in various setting such as home fish tanks, commercial display aquariums, and so on... With better water flowing management, making it great accessory for aquarium enthusiasts. Specifications: Component: ABS Size: Approx.9.2x6CM/3.62x2.36inch Color: 2 Option Quantity: 2Pcs or 4Pcs(with 2pcs duckbill outlet) Package Includes: 2Pcs or 4Pcs Aquarium Outlet note: 1.Please allow 1-2cm errors due to manual measurement, note that you donot mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.