Since developing the world's first knock-type mechanical pencil in 1960, Pentel has continued to produce various world's firsts. It is the ultimate flagship model that brings together the mechanical pencil technology that has been pursued for half a century. Equipped with a mechanism that automatically pulls out the core each time the pen tip pipe separates from the paper surface. You can continue writing with just the first knock. The pipe at the tip of the pen slides according to how much the core is reduced. Since I write while protecting the core with a pipe, it will not break even with an ultra-fine core.