Dishwasher Safe, Microwave Safe, Freezer Safe, Oven Safe to 300 degF. Stainless steel wire clamp, airtight natural rubber seals, straight body. Perfect for: preserving/canning, countertop, pickling, ground coffee. This package contains Le Parfait glass preserving jars with NEW Stainless Steel wire, presented within environmentally friendly, compostable cushioning. Le Parfait has been dedicated to preserving your healthy lifestyle needs - and the world around us - since 1930. 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.