Our Mugs are made of Superior Grade Copper. Unlike other generic mugs that are made of zinc, nickel or stainless steel with a copper finish, we make sure that each mug weighs enough to feel solid in your hand with perfect size. We provide 4 copper straws + 4 exclusive Coasters in a Perfect Gift Box. We have created a fantastic stable base for your mug. Our straws are exclusively made wider so they are extra easy to drink from and clean.