Convert Wide mouth Mason jars into stylish storage jars easily with these sustainable bamboo mason jar lids. Made with sustainable bamboo with a removable silicone seal- these lids come in Wide size mouth. Turn old pasta jars, canning jars, etc into storage of all kinds from the kitchen pantry to the office with this sustainable zero-waste swap! Size: Fits Wide-size Mason jars: 3 in (76 mm) inner and 3 3⁄8 in (86 mm) outer diameter, versions. Mother Earth Approved: Made from high quality and smooth, naturally antimicrobial bamboo.