SunSun 3-Pack PLUS Coarse Fine Filter Sponge Pad for SunSun HW302 Canister Filter Convenient 3 packs fine filter pad replacements Includes 1pack coarse filter pad Fits Sunsun HW302 and other re-branding canister filters Dimension: 6.75 (L) x 6.75 (W) x 0.75 (H) Provides both mechanical and biological filtration