Unlike most French Presses, ESPRO uses two micro-mesh filters to strain your coffee grounds, resulting in smoother, grit-free coffee. A silicone lip lines the dual micro-mesh filters to create a tight seal when you press the plunger down. This seal dramatically slows down extraction of your coffee —so your brew doesn't get bitter over time. This unique, patented technology works in harmony to streamline the brewing process, making it easy to brew café-worthy coffee in just four minutes at home. Insulated, double walled stainless-steel walls, handles, and knobs not only look sleek, but keep coffee warmer for longer and provide more durability than traditional glass presses. BPA, BPS, & Phthalate free.