A1377 Features: -Carbon. -Provides critical stage two chemical filtration. -Large amounts of surface area for the adsorption of impurities. -Leaving your aquarium water crystal clear and sparkling. Product Type: -Chemical. Pet Category: -Fish. Generic Dimensions: -Weight: 0.37 lb. -4'' H x 3.3'' W x 2.8'' D. Dimensions: Overall Height - Top to Bottom: -4 Inches. Overall Width - Side to Side: -3.3 Inches. Overall Depth - Front to Back: -2.8 Inches. Overall Product Weight: -0.37 Pounds.