Beer cup is made by Moso bamboo which has grown for more than 3 years, we use the bamboo knot to achieving 100% zero waste. Together with specially designed 550 Paracord rope that makes the bamboo handle more user-friendly. Perfect size for the outdoors! After high temperature carbonization, we use the EPnS water-based wood coating for prolonged durability and enhanced antibacterial properties. Bamboo fiber performs better than glass and ceramic in keeping the temperature and flavor of your beverages.