For a long time, chalk not only brings wisdom to people, but also brings deep harm to teachers and students. Chalk ash is harmful! Chalk ash causes inflammation in the respiratory system, skin, nose and throat of teachers and students, and damages the lungs and kidneys. Farewell to dust has become a long-cherished wish of teachers and students for many years. Our company's products have solved this major problem, completely eliminated chalk writing, through Dustless writing, will introduce environmental protection and health into the classroom, won high recognition and praise from teachers and students.