To enhance the nosing experience of the Glencairn Glass, pour your dram, and set one of these covers on top. When you’re ready to nose and taste your whisky, slip off the cover, and enjoy. This greatly helps to concentrate all of the aromas of your fine whisky. These Watch Glass Covers are 50mm diameter, and are concave or dish shaped, as a real watch glass cover should be, so that they sit securely on the rim of your Glencairn Glass.