The cap snaps on to a standard neck form, and can be used for a variety of personal care products, as well as food and beverage items. Why so important? Until now, a Stropol spokesperson said, "the only commercially available caps to fit the standard preforms have been ordinary screw caps, most commonly used for beverages." The cap also provides a leak-free seal because of its tailor-made fit.
Source: Cosmeticsdesign-europe.com