Dishwasher Safe, Microwave Safe, Freezer Safe, Oven Safe to 300 degF. Stainless steel wire clamp, airtight natural rubber seals, rounded body. Perfect for: preserving/canning, pantry storage, fermenting, soups. Utilize these brand new, versatile Le Parfait glass jars to preserve your seasonal harvest, revitalize your pantry storage and bulk-goods shopping, serve up a decadent homemade spread, or craft the perfect gifts for your loved ones. Le Parfait glass preserving jars are popular because they are made with all-natural materials, are easy to use, save you time in your daily schedule, offer a large range of various sizes and styles, are simple to clean, and the global website supports you with engaging resources.