Solid copper. Uniting modern style with ancient craft, we created our 18-ounce copper Mule mug in the social spirit of enjoying your time and company, the ritual of mixing your cocktails and serving your guests. Our superior quality offers you long-lasting beauty with a durable shine beaten into our heavy gauge hammered copper. -Copper handle, 18 fluid ounce capacity mugs, 4.25 inches tall, 5.75 inches mouth width -Pure copper from 100 percent recycled sources -Copper handle tig welded to the body -Heavy gauge, durable, made to last for generations