Unopened! ☺︎ When shipping, I will open the package and make it the size that fits in a mailbox. ♡・・・・・・♡・・・・・・♡・・・・・・♡ Ion filter, perfect for cat water fountains, 5 pieces, helps maintain health. - Product Name: Pure Crystal Filter for Lower Urinary Tract Health, 5 pieces - Application: Filter for cat water fountains - Filter Type: Ion filter - Features: Uses activated carbon and ion exchange resin to remove calcium and magnesium - Quantity: 5 pieces Thank you for viewing. ♡・・・・・・♡・・・・・・♡・・・・・・♡ Please confirm the product description and purchase after you are satisfied. ⚫︎ Immediate purchase is OK if you agree with the profile and product description. ⚫︎ If you pay at a convenience store or ATM, please let me know the scheduled payment date for smoother shipping. ⚫︎ For items with shipping included, I will choose the shipping method, and they will be shipped in simple packaging. ⚫︎ Clothing may be compressed for shipping. ⚫︎ If you specify a shipping method, we may charge a separate shipping fee, so please consult with me. ⚫︎ I have a cat. For those who understand used items, thank you. #purimochi