**1 jar has slight chip on threading (pictured)** These mason jars include precise volume markings parents need for feeding. The lids include a silicone seal so that when screwed on tight, they will help to preserve freshness and prevent freezer burn.  Use jars for storage, then add silicone nipples, sleeves, caps, sippy tops etc… as baby grows. Includes: -8 Glass jars (4 are 4oz size, 4 are 8oz size) -Plastic lids with internal silicone seal ________________________ 4 oz glass jars have volume markings up to 2 oz, and a total capacity of 4 oz when filled near the top 8 oz jars have volume markings up to 6 oz, and a total capacity of 8 oz when filled near the top Freezer safe for breast milk and baby food storage Internal silicone seal to prevent freezer burn Wide easy to clean design, dishwasher safe Compatible with all Mason Bottle baby bottles, sippy tops, etc. Minimalist design to upcycle beyond baby stage Bottle warmer safe when thawed (NOTE: Any glass jar will break if totally frozen and exposed to an extreme temperature change)