A wine bottle is a bottle use for holding wine, generally made of glass. Some wines are fermented in the bottle, others are bottled only after fermentation. They come in a large variety of sizes, several named for Biblical kings and other figures. The standard bottle contains 750 mL, although this is a relatively recent development. Wine bottles are usually sealed with cork, but screw-top caps are becoming popular, and there are several other methods used to seal a bottle.