Teachers chalk manufacturing, and the German Kingsway crayon (certified), Guangzhou, Shenzhen and teachers chalk provided by the German Kingsway Industries Limited. Shenzhen and Germany Kingsway Industrial Co., Ltd. (hedehuifu.1688.com) is specialized in the "chalk, chalk graffiti, teaching chalk, Yi Nina chalk, chalk graffiti home" of the enterprise, the company adhering to the "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Chen Ping. Shenzhen and Germany Kingsway Industrial Co., Ltd. to introduce the knowledge of teachers chalk chalk prices, according to the labor health information to teachers chalk manufacturing, production and living environment of dust particles in the air, 10 to 20 microns in diameter or more, through nostrils sucked most timely by Nose, nose, pharynx, larynx barrier, attached to the small airways and alveolar mucosa. If it is on the body of harmful substances (such as silica, asbestos), accumulated more teachers in the alveoli and small airways in chalk order, it will cause damage to the human body. From the foregoing, chalk dust particles are large, most are not sucked into the lower respiratory tract, coupled with the plaster itself is toxic to humans, the medical profession has also not yet been reported due to inhalation of chalk dust caused lung disease. Chinese labor in the health sector, the relevant provisions of the occupational pneumoconiosis, nor will chalk as the cause of the lung. Multi chalk crayons, colored chalk, chalk graffiti, graffiti chalk color of choice and Germany Kingsway Industries Limited. Shenzhen and Germany Kingsway Industrial Co., Ltd. to introduce radical Fame chalk writing ears knife, monaural knife: knife ears first stroke - the cross-left hook painting can write faster; vertical with the left ear pick foot vertical, do not seal the ear incision; right ear and monaural vertical painting with a knife needle hanging vertical, and seal the ear incision. Ai Nina chalk, chalk graffiti home, clean chalk preferred and Germany Kingsway Industries Limited.