Features: Engineered with high densities Polyvinyls alcohols materials, these replacement sponges (4 pack) deliver debris absorption for Dolphin cleaner 6101611, efficiently capturing particles as small as 20 microns while maintaining structural integrity through multiple cleaning cycles. The polymer enhanced increases abrasion resistance by 40% compared to standard sponges, ensuring extended durability across concrete, vinyls, and fiberglass pool surfaces without shedding microfibers. Ideal for residential pool owners, hotel maintenance teams, and commercial facilities requiring reliability, crosses compatible cleaning solution for popular robotic pool cleaner models. Perfect for weekly maintenance of in ground pools, post storm cleanups, and pre season preparation, effectively removing spores, sand granules, and organic matter from pool floors and wall. Features biodegradables Polyvinyls alcohols construction that decomposes 70% faster than conventional materials, paired with simple installation that securely into Dolphin cleaners in under 15 seconds. Specifications: Dimension:9.19x2.59cm/3.62×2.59in Component:Polyvinyls alcohols + mixture Package Includes: 4pcs Durability Sponge Filters note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.