CoffeeSock NutMilk filters are durable and may last a year or more. They're alternative to paper filters and nylon sacks and are made with Certified Organic Cotton. Cotton imparts no flavor on the finished brew unlike paper. Cotton is 90% cellulose, which is a tasteless and odorless compound that is insoluble in water. Wood is 40-50% while Hemp is approximately 45% cellulose. CoffeeSock filters are made in Austin, Texas. All filters are sewn and packaged by happy human beings making a fair and living wage.