Usage Tips:Package Includes: This package comes with 100 chalkboard pens, enough to use and replace, each dry erase pen measures about 11.3 cm/4.45 inches, the perfect size for your use Smooth writing: Made of high-quality plastic, reliable and unbreakable, smooth and clear writing when smearing, quick-drying ink, low odor, easy to erase EASY TO USE: The magnet on the marker cap sticks easily to the metal whiteboard surface, saving space; easy to use, -free and clean surface Wide applicability: dry erase markers can be applied to dry erase boards, cardboard, glass and most non-porous surfaces, suitable for home, office, school, classroom, etc., to meet your different needs Colour:As shown Material:plastic Package Contents: 100 x chalkboard pens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.