1. Reduce chalk opponents and contaminated clothing;
2. Let your fingers no longer to worry about peeling;
3. Let your delicate lubricated by hand is no longer chalk harm;
4. Save chalk, chalk avoid being broken during use;
5. The teacher's essential goods and exquisite senior gifts;
6. This applies to the diameter of chalk clip 9-10mm of chalk (chalk fine head diameter must not be less than 9 mm, otherwise the chalk too small, does not fit).
When using chalk fine head first, first write out the other end portion of the crude, and then change the other end of fine writing on the outside, inside thicker at the other end. This can save as much as possible chalk, but there will always be a small part of the fine header clip live, some remaining, this is normal. (If chalk off in it, you can open the top lid white, with a pencil top of the can)
There are spring, you can manually retractable, like pencil works.
