ARCA X-Tract Brew. Heat-resistant borosilicate glass jug with a patented double-layer filtration system. The filters are produced using a traditional etching technology, which ensures a minimal transfer of coffee grounds into your cup. Highly skilled glass blowers make the handmade glass jugs. The lid is made of porcelain with a patented silicone ring that holds the lid close to the jar to prevent the lid from getting into your freshly brewed coffee when you pour.