compatible with Whisper Filter: Our filters are perfectly compatible with for Whisper 20i, 40i, IQ20/30/45/60, PF20/30/40/60 and Repto Filter in sizes 7.1 x 5.1Inch for 20-60 gallon aquariums Triple efficient filtration, clearer water quality: Double-layer high-density filter effectively captures the residue and fish excrement in the aquarium; Super strong activated carbon quickly remove odors and yellow substances, make the aquarium glass without scaling, keep the water crystal clear, and maintain the health of the water quality Ready-to-use, easy installation: no need for complex assembly, out of . The edge of the filter element is reinforced to prevent the leakage of toner and a clean and tidy process design, stability: Built-in ABS frame, uniform distribution of activated carbon and filter media, to that every drop of water is fully filtered. ABS plastic edges are more and to deformation, making them a for Whisper filters Intimate service, regular replacement suggestion: It is recommended to replace the filter element every 2-4 weeks to maintain the filtration effect and provide a healthy and fresh living environment for your fish. Color:White & Blue Material:plastic Package Contents: 16 * Filter Cartridges 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.