VIOLUX 400ml Ultraviolet Miron UV Glass Airtight Jar and Stash Container, Smell Proof for Herbs and Food AIRTIGHT + SMELL PROOF Our glass containers assure optimal freshness, potency, longevity and quality. SUPERIOR PROTECTION against harmful light rays that cause organic materials to breakdown and decompose rapidly. LIFE ENHANCING violet glass allows nurturing UVa and infrared light rays in that preserve organic materials, freshness, color, aroma and taste. SCIENCE + BEAUTY violet glass containers are extremely effective as well as beautifully designed to add more value to your product. MONEY-BACK GUARANTEE if you are not 100% satisfied with you VIOLUX glass products you can return them within 30 days for your money back.