Simply Green Solutions Acrylic Mason Jar Mugs - Double Wall - 18oz. Capacity - Clear A new twist on a classic design. These Mugs have the same feel as those nostalgic old time glass mason jars but are made from durable acrylic material. Safer for use around the swimming pool, at the beach, and in the hands of young ones. Double Wall Insulation with solid one piece outer body and carrying handle. Threaded Lid, with Silicone Gasket Seal, and plastic Straw included. BPA Free Hand wash. Not for microwave or freeezer use.