Durable Design: Includes a stainless steel band that resists rust during normal use. Unlike standard Mason jar rings, it is fully dishwasher safe for easy cleaning. Premium Materials: Made from 100% food-grade LFGB-certified silicone, which meets a higher European standard, and 18/8 304 grade stainless steel. BPA-free and non-leaching for safe, eco-friendly use. Family-Friendly: A half pint jar with a regular mouth drinking lid makes a perfect toddler cup / sippy cup! Add a silicone koozie to protect the glass from breakage! Our kids love to use these for hot cocoa in the car and fruit smoothies on the go and we love that the beverage stays contained and the kids (and car) stay clean! Versatile Use: Compatible with any Mason jar size including half pint, pint, pint and a half, quart, or even half gallon. Also works well with straws up to 6mm for regular mouth jars and up to 8mm for wide mouth jars. The lid grips the straw securely and keeps it in place. Multi-Functional: Safe for use in the dishwasher, freezer, and microwave (without the band). These lids are designed for everyday convenience while maintaining safety and style.