This is a set of two replacement cartridges for the Micro Nano Bubble Shower Head Bollina Pulito (for water purification and chlorine removal). Each cartridge is estimated to last for approximately 2 months. Filter Material: Calcium sulfite Removes: Residual chlorine Filtration Flow Rate: 8L/min Total Filtration Capacity: 4000L *Does not remove mold odor. *Do not disassemble the cartridge. *Cartridge lifespan may be shortened depending on water quality, water flow, usage conditions, and regional differences. *Cartridges only; the shower head itself is not included. I purchased these on Rakuten for 5600 yen, but I am selling them because I switched to a ReFa shower head and no longer use them.