The 420 Science UV Screw-Top Jar with Hello Write & Erase design is made from machine-pressed glass and features a screw-top plastic lid with an airtight seal to keep your stash fresh with all the smell inside. Write your strain details on the label area and simply wipe off when your stash changes. 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.These 420 Science glass screw-top jars come with an amazing lifetime warranty against breakage!Reviewed by High Times as “the best in herb storage”.