Description:Indisputable that it is easy to use because the product is with the adoption of minimalistic feature. It is flexible and durable, not broken by scrubbing with strong water filtration, can be used repeatedly after cleaning, suitable for physical and biochemical filtration in fish tanks.Undoubted that its compact size and lightweight body ensure the product features with portable. It has three-dimensional structure, multiple filtering. Remove the middle cotton core, enhance the average adsorption force, and make the circulation more smooth.The product is made of premium cotton. Thickened fiber thickens the density and increases the multi-filtration effect to increase the filter culture area.The length of product is 6.5cm and the width is 7cm.Suitable for built-in filters such as Songbao 3300 series or Minjiang Golden Diamond series.Item Name: Filter SpongeMaterial: CottonFeatures: Useful, Thickening, High DensitySize Details: 6.5cm x 7cm/2.56" x 2.76" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. Reminder: The cotton wick may be squeezed and deformed during transportation, and it will automatically restore its shape after a few hours of placement.Package Includes:1 x Filter Sponge