Double filtration, effectively lifting filtration 50%, filtering residue, more pure. Made of stainless steel, , rustproof and washable. Reasonable design of filter components not slide down, effectively filter coffee powder and tea leaves. Up to 95% light transmittance, cold and hot glass, can withstand 150 degrees instantaneous temperature difference. More than 200 filtration tests are repeated to that the coffee extraction concentration maintains a of damping.