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