Made from 100% renewable raw materials, they are long-lasting, and home compostable with household waste. The rounds measure 2.36 inches (6cm) and are made from 70% Scandinavian wood fibers (FSC), and 30% cotton fibers that are too short for the textile industry to use. The case holding them is made from Ocean Waste Plastic, so you are actually reducing plastic in the ocean when you're buying LastRound!! The case holds 7 reusable cotton rounds that feel and look just like your normal cotton rounds. One pack works for up to 1000 uses.