Well-made of good materials, durable and practical. Effectively remove some bad substances in water. Use this box to place the fish tank filter to absorb impurities, purify your water naturally. Fine workmanship ensures the efficiency of water . Features -Color:Transparent -Material:Acrylic -Size:38.50X13.00X7.00cm/15.13X5.11X2.75in -Note:Suitable for aquarium walls with a thickness of 3-8 mm\0.11-0.31in. -The structure is simple and easy to use, which can meet different sizes of fish tanks. -Large water storage space is convenient for effective cultivation of beneficial. -This product is of safe material and durable, you can use this product with confidence. -It can help the fish tank forms a good cycle and are very safe and practical. -Although this product is simple , it is very practical when used. The high transparent appearance allows you to show the beauty of your interior decoration. Package list: 1 x Filter Box