This 6 pack of replacement cartridges is for Penguin 160/170/300/330 power filters. Each preassembled cartridge slides easily into place, providing superior mechanical and chemical filtration, and making replacement fast, dry and effortless. The cartridge mechanically filters water through a pad of double thick polyfiber. Debris and waste particles are trapped, and water is chemically filtered through Marineland's Black Diamond Premium Activated Carbon.

This is OEM from Marineland. These are original cartridges.