Compatible Size: This Pond Filter Media for Pond Fountain Pump ,Replaceable for CUF-6000 Filter & 660 GPH Pond Pump Filter Fountain Pump Premium Quality Materia: This Constructed From High-quality Sponge Material, Pond Filter Pump Sponge Offers Durability and Reliability, Asy to Clean and Can Be Reused Multiple Times, Suitable for Various Types of Ponds Effective Filtering: This Pond Filter Pads for Pond Fountain Pump Can Effectively Filtering Out Impurities and Debris From Your Pond, Ensuring a Healthier Aquatic Environment. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Color: Blue Material: Sponge Package Contents: 4 Pcs x Replacement Pond Filter Media for Pond Filter Pads 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.