Intex Filter Cartridge 59904 filter cartridge is used with the 300 gal/hr filter pump (model 58605 or Krystal Clear M2). Contains 2 E filter cartridges. Type E filter cartridge.(3 5/8" Tall x 3 1/8" Top Diameter x 1" Interior Hole Diameter) This is for TWO (2) filter cartridges Made By Intex The leader in Pool Accessories Durable, Affordable, and Convenient