Description: Small Fish Tank Filter Overflow Box: Aquarium Hang On Filter, hanging fish tank top filter box quietly delivers clear water flow throughout the aquarium Efficient Multi-Layer Filtration: This filtration system features a three-layer design that ensures water purification, keeping your aquarium or turtle tanks clean and clear Different Size to Choose: 3 boxes aquarium filter is suitable for 20 - 38 cm aquarium tank or turtle tanks; 6 boxes aquarium filter is suitable for 38 - 55cm fish tank or turtle tanks Easy Installation and Use: Turtle tank water purifier drip flow box, easy access to change filter pads and effortless maintenance, practical fish tank accessory Quiet Operation: Aquarium Filter Box operates quietly, providing a peaceful environment for both you and your aquatic pets Specification: Material: ABS   Size Chart: 3 Boxes: 19.5cmx12cmx26cm/7.68inchx4.72inchx10.24inch Or 6 Boxes: 35.5cmx12cmx26cm/13.98inchx4.72inchx10.24inch Package Includes: 1 Aquarium Hang On Filter Box( As you choose) Note: Please allow slightly errors 1-2cm differences due to manual measurement.