The 420 Science UV Screw-Top Jar with Rainbow Mind design by tattoo artist Winston the Whale is made from machine-pressed glass and features a screw-top plastic lid with an airtight seal to keep your stash fresh and all the smell inside. The UV glass protects your precious herbs from damage due to sunlight.These stash jars are made from European glass and are available in 4 sizes:Small: holds about an 1/8 of an ounce (3.5 gr.) and measures 5.1 cm. tall by 5.1 cm. wide.Medium: holds about 1/4 of an ounce (7 gr.) and measures 10 cm. high by 7.6 cm. wide.Large: holds about 1/2 an ounce (14 gr.) and measures 10.1 cm. high by 7.6 cm. wide.X-Large: holds about 1 ounce (28 gr.) and measures 14.0 cm. high by 7.6 cm. wide.Amazing lifetime warranty against breakage!Reviewed by High Times as “the best in herb storage”.