SunSun PLUS Coarse Fine Filter Sponge Pad for SunSun HW402B Canister Filter (6 White + 2 Blue) by Sun Microsystems Convenient 6 packs fine filter pad (white) replacements Includes 2 pack coarse filter pad (blue) Fits Sunsun HW402B/505B and other re-branding canister filters Dimension: 7.0 " (L) x 7.0 " (W) x 0.75 " (H) Provides both mechanical and biological filtration