The 420 Science Clear 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 and all the smelly goodness inside. The glass will protect your precious herbs from damage and is both airtight and water-tight.These stash jars are made in the US and are available in 5 sizes:X-Small: holds about 1/8 of an ounce (3.5 gr.) and measures 4.5 cm. high by 4.5 cm. wide.Small: holds about an 1/8 of an ounce or more (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 7 cm. high by 5.7 cm. wide.Large: holds about 1/2 an ounce (14 gr.) and measures 8.9 cm. high by 7.0 cm. wide.X-Large: holds about 1 ounce (28 gr.) and measures 10.2 cm. high by 8.9 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”.