Threshold&trade; Moscow Mule Copper Mug Serve up your drink in style with the retro Threshold Moscow Mule Copper Mug. Originally crafted in the 1940s specifically for drinking Moscow Mule cocktails, this legendary mug has made it mainstream and is ready to serve up any drink you desire. The sturdy, stainless steel mug will help keep cold drinks while the copper finish creates a classic feel. Boasts a 20 oz capacity. Hand wash.