Made Of Non-Toxic Resistant Borosilicate Gla Closure Of Excellent Bamboo Lid, Provided With A Silicone Seal. Cylindrical-Shaped & Sleek Design With Gla Surface And Wide Mouth Which Convenient To Deposit And Take Out Well Cleaning. Bamboo Lid And Silicone Sealing Ring Can Keep Out Air, Creating An Airtight And Moistureproof Environment To Store What You Need.