HQRP 4-Pack Replacement 30 ppi Foam Pads Rena Filstar xP XP-1 XP-2 XP-3 XP-4 XPS XPM XPL XPXL Aquarium Canister Filter Coaster HQRP&reg; 4-pack Foam Filter Replacement + HQRP&reg; Coaster; For removal of fine debris and small waste particles; 30 pores per inch; Compatible with Filstar XP Filters; Dimensiones: 6 1/4"x 6 1/4"x 3/4"; Can be rinsed and reused; Replace every 3 months; 2 weeks DOA replacement warranty!