This is a water purifier cartridge. I had some in stock, but I won't be using them anymore because I'm changing my kitchen. The contents are new, but I've written some notes on the outer box, so I'm selling them at this price. KVK water purifier cartridge PZ871, applicable water pressure 0.1~0.3MPa, usable water temperature 5~35℃. - Brand: KVK - Model: PZ871 - Type: Water purifier cartridge - Specifications: Applicable water pressure: 0.1~0.3MPa, Usable water temperature: 5~35℃ - Contents: 3 cartridges Retail price 3 cartridges: 13,000 yen 1 cartridge: 5,500 yen Thank you for looking.