Two products in one! These wide mouth lids function as both a fermentation lid and also as a straw hole tumbler lid! The 10.5mm hole will accept a straw and is also the perfect size for our fermentation airlocks! (sold separately)
Attach them using any existing wide mouth band / ring.
Made of 100% silicone rubber, these lid inserts are dishwasher, freezer, and microwave safe! Silicone is a safe, green, non-plastic (BPA free) material for food use that does not leach any chemicals.