Stor-All's Grip-Tite line of food storage products feature patented, textured lids that will give you an amazing "Grip That Never Slips!" Each lid in this 10 piece set features specially textured edges that provide a better grip for opening and closing, a tight seal for less spills and fresher food. A built-in Micro-Vent opening allows you to keep the lid closed while Microwaving. All Stor-All food storage products are made from BPA-Free virgin plastic, are Microwave, Dishwasher & Freezer Safe and stack or nest conveniently on your counter or in your cupboard.