It's a sight to behold while you're brewing. That is why ESPRO developed the P3 so that others can witness the wonder of the ESPRO Press in action. The P3 perfects the traditional sophistication of a traditional glass French press through design and technology. Simply explained, compared to other glass presses on the market, the P3 is safer, more robust, and keeps beverages warmer. They developed a patent-pending Safety Lock™️ that entirely secures the glass inside the steel cage, putting a stop to the industry's problem with glass slipping out during pouring. Schott Duran® glass, created in Germany, is 40 percent thicker than typical press glass. They also contained our proprietary double micro-filter, which ensures a clean, tasty cup free of grit and debris. Tea filter not included.