Made Of 100% Food-Grade Silicone. Durable, Unbreakable & Lightweight. A Flexible Alternative To Glass. Maintains Shape And Integrity. Reusable. Crystal Clear Design Gives The Look Of Traditional Glass. Built To Resist Cracks, Chips And Scratches. Perfect For Wine, Cocktails And More. Non-Slip Grip And Base. Microwave & Freezer Safe. Meets FDA Requirements. BPA Free. Hand Wash Recommended.