The Acting Company in Japan three crystal mixer paper, waterproof mixer paper, have specialized test equipment monitoring product density and permeability, tuning stability, for different customers, can also be tailored specifically for customers special density Special ventilation flow, special tuning thickness paper products. Japan's three crystal mixer paper density, average density holes, excellent thickness uniformity, good waterproof effect; Uses: This product has a damping effect on sound waves, the sound of fiction spike, improving the sound frequency characteristics are extremely effective effect. Apply the microphone, speakers, microphones and other audio products to use as a mixer, to improve its audio properties while serving as dust network, waterproof network use