No respectable pirate would be seen drinking out of a clear plastic cup! The only proper drinkin' vessal be a hearty tankard, plus they be great in a bar fight, arrrgh! All of our pewter is lead free.
In previous centuries, the pewter used to make tankards often contained lead, which not be a thing we want to reenact, arrgh! Check out arrrr unique Drinking Baldrics too if ye want to carry yer rum hands free.