4 pack. Fits any size Regular Mouth Mason jars, which are 2 3/8″ internal diameter. Leak-proof with included silicone seals. Each pack includes four lids and four Silicone Sealing Rings. Microwave, dishwasher, freezer safe. Polypropylene plastic (BPA-free) with silicone seal. Store and carry any liquid or pourable dry good (such as sugar, salt, grains, seeds, nuts, small candies, etc). The sturdy carry handle makes it easier than ever bring your jar on-the-go!