Keep your hands from chalk dust- This chalk clip is made of high-quality plastic, environmental standards, both beautiful and durable. use it to write chalk words can reduce chalk ash so as to prevent dirty to hands and clothes cuffs.It is a practical gift for students or teacher .Universal and easy to carry-This Magnetic Chalk Holder is easy to carry, easy to write, suitable for most schools that use the round chalk and hexagonal chalk, suitable for chalk diameter between 8mm ~ 10.3mm.Design simple and use convenient- Press type, use your thumb lightly press, chalk will expose little by little ;Double spring design, easy to use, internal bite clearly visible, five-sided surround, make the chalk tightly hooped.not easy loose .Magnetic design easy to place- It has a magnetic stripe on the back of chalk clip, can be adsorbed on the metal surface or whiteboard ,when you don't use ,it can also strongly stick on magnetic chalkboard.6 pcs in a package ,perfect for for school, office, meeting room and industrial use .Material :PlasticColor :blue ,yellow ,red ,green randomly Size :9.5 *2 cm Package :3 x Chalk Holder Operation: The use of Chalk Clip Holder similar as ordinary Automatic Pencil/Pen Place the chalk in front of the chalk clip Press the chalk clip rear end spring, the front end opening and will open, put the chalk into opening at this time Adjust well the length of the chalk writing, then release the back-end it will grip . Writing normally as usual.Note: Random color, don't accept the specified color.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.