[Airtight Lids] - The food grade glass jars come with split-type sealing lids and bands, which ensure air tightness and leak-proofness, making them perfect for preserving and canning. Refrigerator Safe. [Portable Mini Size]-These mini jars are convenient for subpackage. You can pack large jar of jam into 4oz small cans for easy portability. Perfect to put in a bento box, backpack, pouch to take to a picnic or going out. [Easy to Fill and Clean] - The wide enough mouth and straight smooth inner wall make it easier to fill and clean, remaining no food residue on the wall. Besides, the split-type lids futher ensure thorough cleaning. Note: The glass mason jars are dishwasher safe, but lids are Not Recommended. [Multipurpose Use] - The clear dessert jar is easy for visibility. They are perfect for food or jams, or jelly, honey, oat, etc. In addition, with your innovation, they can become handmade gift, like DIY candles, party favors, wedding favors and so on. [Package Content] - 4 oz little mason jar x 16; "handmade" label x 20; black lable x 16; a bundle of 13m hemp rope. With these free accessories, you can better organize your jars and decor your DIY gift. Hope you will enjor them!