300 ml Breakaway Mason Jar. This breakaway jar has the word MASON on one side, measurements for up to 12 ounces on one side, and up to 300ml on the other side. Breaks easily upon impact. Actor Safe!Approximate Size: Weight: Please note: SHIPPING ONLY – NOT AVAILABLE FOR IN-STORE PICKUP – These items are custom made to order, and may take up to 7 days to ship. If you need them sooner, please contact us to verify availability.