It is beautiful and cleverly made that that patented product is a tools and implements of a new environmental protection teaching for gathering wiping first word, the eraser is an integral whole, its shape, and divided by the dust  effective, deep suffer large what teacher living to like.That product can thoroughly dissolve the powder dust  , and improve the classroom's teaching environment, and avoid for long time the teacher eat the chalk ash because of the ?? " trouble faucitis  , phthisic when complaint Let the teacher get away from the ?? chronic of the powder dust  the premeditated murder thoroughly" is 21 centuries to dedicate the best gift that teacher does ever had.