Replacement pack for Will-Off, which generates chlorine dioxide, offering 60 days of effectiveness. - Product Name: Will-Off Replacement Pack, 60 days - Purpose: Chlorine dioxide generator - Quantity: 1 - Usage Period: Approximately 60 days - Manufacturer: Oki Pharmaceutical This item will be sent via regular mail in simple packaging. If you are concerned, I can change the shipping method, and the price will change accordingly. Please comment if you'd like to do so. Thank you for viewing.