Pint glass small pits which aid in nucleation, allowing the gas within it to be released more easily, thus preserving the head. Without the aid of these pits a regular pint glass will keep a head for only 3 or 4 minutes before appearing 'flat'. The markings come in a variety of styles ranging from a simple circular or square hatched pattern to more complicated branding messages. Pint glass collecting is an increasingly popular way for individuals to commemorate their visits to popular tourist destinations, most notably to microbreweries or sports arenas. These destinations often sell pint glasses adorned with their logos,
Pint metric measure. Such milk bottles are no longer officially referred to as pints. However, the "pint glass" in pubs in Australia remains closer to the standard imperial pint, at 570 ml. It holds about 500 ml of beer and about 70 ml of froth, except in South Australia, where a pint is served in a 425 ml glass and a 570 ml glass is called an "imperial pint". In New Zealand, there is no longer any legal requirement for beer to be served in standard measures: in pubs, the largest size of glass, which is referred to as a pint,