Features: DUSTLESS AND EASY TO USE. All these chalks are well coated to prevent hands from coming into contact with chalk dust when using. Erase easily, no residue on the chalkboard when removed. Chalk generates little dust and fallout minimizing chances of smudging and messes when writing or drawing. NON-TOXIC AND DURABLE. Made from high quality material, non-toxic and safe for kids and professional use. No harm to human body or for health. Keep you and your kids safe with our products and be comfortable in using them. VALUE PACKAGING. Each package comes with 20 pieces dustless chalks. Great for the school, classroom, children DIY drawing, etc. Non-toxic and marks smooth and erases easily on blackboards or chalkboards. WHITE&COLORFUL. Two kinds of choice, White Chalk 20 Pack, Color Chalk 20 Pack. Vivid and clear bright colors grab student's attentions quicker which help them to for focus and concentrate in class, lectures, online courses, and even home school. brand new and high quality STRONG AND SMOOTH. Prmeium dustless chalks sets. Coated Surface, Non-Toxic, Smooth & Clean WritingAbility to write on various surfaces; for windows, glass, mirrors, plastics, etc. Wipes away easily with a damp cloth. Specifications: Material: for Titanium Dioxide Powder Color: Colorful; White Size: Approx. 7.8x1cm/3.07x0.39in Quantity: 20 Pieces Weight: Approx. 180g Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 Pack Dustless Chalk