These are a set of dryer balls that we made. They are 100% wool without any filters. We used both wet and needle felting to make them. If you haven't used dryer balls in the past I highly recommend you try them out. They are a great alternative to toxic dryer sheets and can be reused for 2-5 years. They save you money, cut drying time and work great. Each ball weights around 2 ounces.