This little coupe is more than just a pretty face. Using a special "Hard Strong" technology they are built super tough and are highly resistant to breakage! It's small size (4.5oz) make it perfect for smaller sized drinks like martinis and Mahattans that don't have a high volume. When making higher volume shaken cocktail with citrus juice like a Daiquiri it is a little tight for size. We like serving up taster sized cocktails in these by splitting a cocktail between 2 glasses.