PURE COPPER - No nickel, tin, or other metals on copper mugs! Only pure copper to give your moscow mule the right taste. PERFECT SIZE - 16 oz. size just like the original copper moscow mule mug. Not too large nor too small BONUS ACCESSORIES - This upgraded model from kitchen science brings your beloved mugs with bonus accessories of 4 straws and 1 jigger worth an extra $14.99 TARNISH RESISTANT - Coated with food grade lacquer on inside and outside to retain its shine. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.