Fangrui Product Details [for Ez-change #1 Aquarium Filter ]for Ez-change Number 1 Filter Is Compatible With 5-15 Power Filters. (please Confirm The Size Of Your Fish Tank And Tank Filter Before Purchase) [efficient Water Purification]each Fish Tank Filter Contains Premium Activated Carbon, The Grid Design Makes Full Contact Between The Activated Carbon And Water, And Long Lasting, It Offers Clean And Fresh Water For Fish, Make Them More Healthier. [timely ]aquarium Filters 5-15 Gallon Fish Tank Are Easy To Change. To Optimal Cleanliness, We Recommend Replacing The Aquarium Filter Cartridges Every 2 To 4 Weeks. No Messy Assembly Required, Changes In Seconds Just Shake And Rinse. [quick Installation]please Turn Off And Remove The Used And Flush The New Under Cool Water To Remove Dust. Our Filter Is Already Set Up And Just Needs To Be Installed Correctly On The Power Filter And It Is Ready For Quick Filtration. Colour:blue Material:sponge + Plastic Size:a: 12 X 12.5cm Package Contents: 6 X Filter Only The Above Pack