Convert your Mason jars into stylish drinking cups with these trendy bamboo straw hole lids! The perfect combination of simple and sustainable! Made out of natural bamboo with a food-grade silicone gasket that affixes it to the jar. Pair with any of our reusable straws! The hole at the top is big enough to fit our 12mm Stainless Steel Boba Straws! Fits Standard Wide(3 3/8″) or Regular(2 3/4″) Mouth Mason Jars Food Safe, Protective Coating Handwash Recommended – High temperatures can wear away the water-resistant, protective coating and make them susceptible to molding. Made from high quality and smooth, naturally antimicrobial bamboo and BPA-free Silicone.