Reduce the mortality of aquarium pets, Let them have a warm and clean living environment. Product Specifications: Material: honeycomb super absorbent activated carbon block Single size: 100*100*50mm Kind tips: 1. It is recommended to place it near the water inlet of the tank pump. 2. Do not place the mesh filter downward, otherwise, it will be blocked and affect the filtering effect. Remark: 1. Due to different lights and screens, the color of the item may be slightly different from the picture. 2. Due to different manual measurements, please allow slight size differences. 3. If you have any questions or problems with the products you received, please contact us in time.