Beer glassware comprise vessels made of glass, designed or commonly used for serving and drinking beer. Styles of glassware vary in accord with national or regional traditions; legal or customary requirements regarding serving measures and fill lines; such practicalities as breakage avoidance in washing, stacking or storage; commercial promotion by breweries; artistic or cultural expression in folk art or as novelty items or usage in drinking games; or to complement, to enhance, or to otherwise affect a particular type of beer's temperature, appearance and aroma, as in the case of its head. Drinking vessels intended for beer are made from a variety of materials other than glass, including pottery, pewter, and wood. International styles Pilsner glass A pilsner glass is used for many types of light beers, including pale lager or pilsner. Pilsner glasses are generally smaller than a pint glass, usually in , , , or sizes. In Europe, glasses are also common. They are tall, slender and tapered. The slender glass reveals the colour, and carbonation of the beer, and the broad top helps maintain a beer head. Weizen glasses are sometimes mistakenly called pilsner glasses because they are somewhat similar in appearance, but true pilsner glasses have an even taper without any amount of curvature. Pint glass The definition of a pint differs by country, thus a pint glass will reflect the regular measure of beer in that country. In the UK, law stipulates that a serving of beer be fixed at the imperial pint (568 ml ≈ 1.2 US pints). Half-pint glasses of are generally smaller versions of pint glasses. Quarter-pint glasses of also exist, and are popular in Australia (now 140 ml from metrication), where they are known as a "pony". These may simply be smaller pint glasses, or may be a special pony glass. In the US, a pint is , but the volume is not strictly regulated and glasses may vary somewhat. Glasses of 500 ml are usually called pints in American parlance. The common shapes of pint glass are: Conical glasses are shaped, as the name suggests, as an inverted truncated cone around tall and tapering by about in diameter over its height. The nonic, a variation on the conical design, where the glass bulges out a couple of inches from the top; this is partly for improved grip, partly to prevent the glasses from sticking together when stacked, and partly to