Tsis yog - tshuaj lom chalk: Nws yog chalk noj qab nyob zoo ntawm cov chalks. Nws yog tsim los ntawm ntshiab gypsum thiab dej, solidified thiab qhuav, thiab edible gypsum yog siv. Feem ntau ntawm kev qhia txawv teb chaws siv hom chalk los ntawm tsev kawm theem qis.
1. Tsis yog-chalk tshuaj lom neeg muaj nyob rau qib siab -chalk. Nws tsis yog - lom nyob rau hauv cov plua plav paug ntawm chalk chalk. Tom qab cov hmoov av tsim los ntawm nws nqus tau rau hauv tib neeg lub cev, tib neeg lub cev tuaj yeem raug tso tawm ncaj qha los ntawm kev tso tawm, thiab yuav tsis nyob hauv lub cev. Txawm tias cov dej hauv kev tsim khoom muaj pes tsawg leeg rau tus dej.
2. Tsis yog-tshuaj lom tus kws qhia ntawv chalk: Cov chalk siv los ntawm cov kws qhia ntawv hauv kev qhia yog tsim los rau kev qhia, tsis muaj kuab paug thiab muaj kuab paug.
3. Non-toxic children's graffiti chalk: according to children's usage habits, chalk that will be fine in the mouth
