The metal straws are made of fine stainless steel, cyclic utilization, eco-friendly and money-saving. The resuable stainless steel straws are dishwasher safe. The small brush especially designed for cleaning the metal straws which makes cleaning job a breeze. Stick in and out then the cleaning is done. The resuable metal straws are made of Rust and Scratch proof-304 stainless steel, never worry it broken, rusted or transformed. You can expect it to look just as good as when you bought it even years later.