Size Compatible: this precut aquarium filter measures approximately 3.74 x 0.7 x 0.7 inches/9.5 x 1.78 x 1.78 cm, compatible with for QuietFlow 10 LED PRO's aquarium filter; Please confirm the fish tank filter model before purchasing. Effective Filtration: this sponge filter helps to remove excess ammonia in the fish tank, and it can also help remove debris, food residue, etc., keeping your aquarium clean and providing a healthy living environment for your pets. Replacement Cycle: replace the filter pad every 2-3 weeks to get the good performance; Rinse the filter pad with water before use to speed up the effect. Sufficient Quantity: you will receive 20 count ammonia reduction filter pads, which can maintain your aquarium filter pad replacement needs for up to one year or more, and solve the helplessness when faced with urgent replacement. Perfect Choice: multi quantity combination, a nice choice for aquariums, or fish lovers who have multiple fish tanks at home, reducing your fish farming costs. Colour:As Shown Material:sponge Package Contents: 20 * Fish Tank Filter Pads Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.