The 420 Science Pop Top Jar with Hello Write & Erase design is made from machine-blown glass and features a glass pop-top complete with airtight plastic gasket/seal to keep your stash fresh and all the smell inside.This jar enables you to write the name of your strain on it. When done simply wipe off ready for the next strain!These US made stash jars are available in 4 sizes:X-Small: holds about an eighth (3.5 gr.) and measures 8.25 cm. tall by 5.72 cm. wide.Small: holds about a quarter (7 gr.) and measures 8.25 cm. tall by 6.4 cm. wide.Medium: holds about 1/3 of an ounce (10 gr.) and measures 10 cm. high by 7.6 cm. wide.Large: holds about 1/2 an ounce (14 gr.) and measures 11.4 cm. high by 8.9 cm. wide.These 420 Science glass pop top jars come with an amazing lifetime guarantee against breakage!Reviewed by High Times as “the best in herb storage”.