Material: the chalk holder is made of good quality aluminum alloy material, sturdy and durable, not easy to get rust or erosion, has a long service lifeHow to use: you only need to press the chalk holder's top button, and put chalk stick from the front; The chalk holder allows you to adjust the writing length of the chalk, then release the top buttonFunctions: using the chalk holder can not only keep your hands clean, but also protect chalks from breaking, suitable for teachers, children's painting and writingcolour: silverMaterial: Aluminum Alloysize: 10x1.3cmPackage Contents:16 x Chalks HolderOnly the above package content, other products are not included.Note: Light 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.