The 420Science X-Small Pop Top jar is made from machine blown glass. The hallmark of this storage device is it's "pop top" closure which helps keep air and smells trapped inside. A heavy duty plastic gasket built into every top ensures your contents are kept safe. The jar holds 3.5 grams of dry material. Available in a variety of permanent logos (a random one will be chose at the time of shipping unless you specify a preference) Measures approximately 2.75" tall by 2.25" wide. Made in the USA and backed by a lifetime warranty.