Material: dust-free chalk Color: yellow / blue / orange / white / red / green Chalk size: length: 7.8cm, diameter: 1cm Weight: about 92g / box Uses: painting, writing, graffiti 1、【Dust-free, non-toxic】It does not contain harmful ingredients such as lead, cadmium, mercury, chromium and bromine, which have passed the strict and environmentally friendly non-toxic quality test report of the European Union. Can be used with confidence.  2、 【Safe and easy to use】Suitable for children, students, teachers and office staff. Let your children express their creativity with non-toxic chalk. The chalk mark is easily washed away with water. 3、 【Smooth writing】Applicable to any non-porous surface, such as whiteboard, blackboard, blackboard, glass, window, mirror, jar, cardboard, paper, wood, etc. 4、 【Low cost】A box of dust-free water-based chalk can be used for 3-4 weeks in primary and secondary schools, and the daily use cost of each classroom is very low. The maintenance cost of audio-visual equipment saved by the use of water-based chalk to reduce dust pollution is far lower than the cost of using pens and pencils. The two offset each other, and the overall cost of use is close to "zero" or even a "negative" number. 5、 【Great gift】12 colored dust-free chalks are used as party gifts or imaginative outdoor gifts for children! 12 pcs Children Dustless Chalks