Super cute and super durable lid for your Mason Jar beverage tumbler! The 10.5mm hole will accept any straw up to 10mm.
 
Attach with the included rust proof stainless steel band!
 
Make it leak proof by adding a silicone strap with plug, also good for fermentation.
 
Made of food grade 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.