The Biorb Filter Service Kits X2 are designed for all sizes of biOrb aquariums, providing an internal filter solution for maintaining clean water in your fish tank. These kits include everything needed to keep your aquarium water clear and healthy for your fish, ensuring a hassle-free maintenance experience for pet owners. With the convenience of purchasing two filter service kits, you can easily keep your biOrb aquarium running smoothly for longer periods of time.