Marineland Rite-Size Cartridge C, 12-Pack Go to amazon.com Related posts The 10 best marineland filter c for 2019 FeatureConvenient 12pk(2) 6 pack boxesMarineland OEM Rite Size C Cartridges DescriptionRite-Size C fits Penguin 200B, 350B, 330B and 170B.Rite-Size B fits Penguin 150B, 110B and 125B.Rite Size C fits Penguin 200B, 350B, 170B and 330B. Value Pack contains (2) 6-Packs.