StillCool Chalk Holder with Storage Hard Case - Blackboard Adjustable Chalk Clip Set (3.7 x 0.6 Inch), 5 Bright Color Chalk Holders are made of High-level non-toxic ABS material, non-toxic and tasteless, also not easy to break and it can long-term use not broken. Chalk Holder Case can effectively protect your hands from direct contact with chalk avoiding drying and cracking, also avoid the child put the chalks in the mouth. Measures: 3.7 x 0.6 inch (9.5 x 1.5 cm), standard size fits kids and teachers, even anybody. These chalk holders are adjustable and reusable. Very convenient for home, school, office, meeting room and industrial use. Packing includes 5 different colors chalk holders, each holder has a white chalk inside. If in a rare case you aren't satisfied with the item, contact us to enjoy 100% cash back.