Glencairn Crystal Glassware Glass Lid 6 Pack – Glencairn Glass These Glencairn Glass Lids are a great way to get a different out of the glass.  Pour your favorite whisky, plut the lid on the top of the glass, wait at least 15 minutes, and you will be able to have a unique with both aroma and flavour! Includes six lids.. For adults of legal drinking age. Please drink responsibly.