Compatible Filter Cartridge for Aqueon: Our aquarium filter cartridge is fit to Aqueon small filter, and the specific size is 3.75 x 0.25 x 2.5 inches. It is very suitable for Aqueon Minibow Aquarium Filters Size 1 / 2.5 / 5 gallon and QuietFlow E Internal 10 on the market. You can always keeping water healthy for your fish and turtle with this aquarium filter cartridge. Upgraded Filtration Structure: We upgraded the structure of filter cartridges to use high density cotton + 50% more nutshell activated carbon + upgraded 6-grid design, which make the distribution of carbon more uniform and won't block the normal water flow and filtration. Excellent Filtration Performance: The filter cartridges is made of high density cotton + 50% more nutshell activated carbon, offer triple water filtration effect that effectively filter and absorb 99% of harmful substances. Filtration performance is perfect than that of other brands. More Effectively keep the water source clean and the healthy growth of fish and turtle. Easy to Install: Please rinse it with water to remove the outside dust, then fully seat it into the filter chamber. Replace it every 2 to 4 weeks to maintain a healthy water environment. Protect the health and safety of your fish all the time. color:White Material: activated carbon Package Contents: 12 x Filters 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.