- Machine Blown Glass.
- Glass Lid With Airtight Plastic Gasket.
- Large Size Holds About 3/4oz.
The 420 Science jars can hold about 1/4oz - 3/4oz of herbs or tobacco, depending on size and will enure it stays fresh. The glass lid has a gasket seal that will pop every time you open the jar. This jar has a place you can write and erase the strain of product that is inside at the time.