Marineland Penguin Rite-Size B BIO-Wheel 150 & 125 BULK Replacement Filter Cartridge (6-Pack) The Rite-Size B Marineland Penguin BULK Replacement Filter Cartridge (6-Pack) is for the BIO-Wheel 150 & 125 Power Filter We've removed the product from the packaging. Doing this lowers the shipping cost, and we pass on the savings with a lower product price.