This Hurricane Spa Filter Cartridge is designed for use with the PWW-10 and Unicel C-4310 models. The cartridge is made by Hurricane, a trusted brand in the industry. It is a type of cartridge filter that measures 4.25 inches in height and length. The item is made in the United States and is suitable for use in home and garden settings. It is not a custom bundle and is sold as a 2 pack.