A capped pencil is composed of a pen barrel and a pen cap; Chinese Luan Liyu invented the world's first "capped pencil" with an open pencil cap. The capped pencil adopts a vortex open design and is molded in one step using mold frame technology. In 2015, it obtained a national invention patent application. The front of the cap of a capped pencil is slightly larger, and the tail adopts a vortex open structure. The spiral structure at the tail of the cap has more fixing features than a closed cap, making it better suited to the use of various wooden pencil shafts. As long as the pen barrel is screwed into the pen cap, it is not easy to fall off, has moderate tightness, is easy to carry, is safe and hygienic, and at the same time solves the technical problem of the pencil being unable to assemble the pencil cap before leaving the factory. A capped pencil consists of a "pen barrel" and a "pen cap"; the pencil stem can be made of wood, paper, or plastic. The pencil cap is well known with the emergence of the "cap pencil". With the endless incidents of injuries caused by ordinary pencil rods, and the incidents of vicious pencil rods hurting children, capped pencils came into being. Pencil caps were originally made of paper pen caps spontaneously made by people, and later became a standard accessory on pencils. For hundreds of years; the more common pencil caps are closed and open pencil caps. The closed pencil cap is difficult to popularize on pencils due to complex structure or usability; the open pencil cap uses an integrated scroll The design can automatically adjust the tightness according to the thickness of the pen barrel, which is suitable for the production needs of cap pencils. This type of cap is made of polyester material. Each pencil cap weighs only 0.5-1 gram. It is easy to use and is the first in the world. A truly economical and practical capped pencil.