Mason Bottle silicone sleeves are compatible with either 4 oz. or 8 oz. regular-mouth mason jars. The 4 oz. DIY Kit comes with a 4 oz. silicone sleeve and two Slow Flow Nipples for 0-3 months. The 8 oz. DIY Kit comes one 8 oz. silicone sleeve and two Slow Flow Nipples as well. Both kits include a plastic cap that is compatible with any size regular-mouth mason jar.
Nipple Sizing Information
Mason Bottle nipples are made from medical-grade silicone. Available in four flow sizes:
Advanced Anti-Colic Ventilation
The nipple uses a dual-valve ventilation system that mimics the human body. Milk flows smoothly to reduce gas and colic.