Usage Tips:Random Colors KEEP HAND CLEANthe colorful plastic chalk clip holder will protect your hands from direct contact with chalk, keep fingers clean, also avoid cracking of chalks, with its protection, the chalk won't break even fall off the desk, effectively reduce waste SIZE DETAILthe chalk holder measures approx. 12.5 cm/ 4.92 inches, suitable for chalks in a diameter of approx. 2.5 cm/ 1 inches, with elastic buckle, simple adjustment of the length of the chalk and easy operation HIGH QUALITY MATERIALthe chalk holder is made of good quality plastic material, sturdy and durable, not easy to get rust or erosion, has a long service life. the railroad chalk holder offers clear and distinct lines on chalkboards, and can be easily wiped by wet towel MULTIPURPOSE USESThese chalk holders are adjustable and convenient to use and clean,it also can prevent the chalk from cracking, effectively improving the use rate of chalk and reducing waste, It's very suitable for children, students, teachers, and office workers, and is an ideal choice for schools, offices, and families