The product is designed with liquid chalk markers which are not only dust and mess free but also extremely opaque and vivid compared to ordinary chalk. The chalk pen used on all the recommended surfaces can be erased easily with a damp cloth or paper towel for its removable design. Made of high quality PVC, it is eco-friendly and easy to use. The weight of this product is eight grams. It is suitable for office, class, drawing or writing on chalkboards, glass, etc. Item Name: Chalk Pen Material:PVC Size:13.5cmx3.8cmx1cm/5.31inx1.5inx0.39in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 X Chalk Pen