BarWerks "Bent Mule" 100% Copper Straws for Moscow Mules (Set of 4) Enjoy a Moscow Mule without the mug! Our copper straws are a great alternative to mugs. BarWerks "Bent Mule" straws are made of 100% copper and measure 7.5 inches. Perfect length for a Moscow Mule served in an old fashioned glass tumbler. Each of our straws is hand crafted and unique. Set of 4 straws. Add some character to your Moscow Mule served in glass or pair with a copper mug for a full Moscow Mule experience!