Pen

The invention provides a pen. A weight is arranged at the tail position of the pen, and it has to be guaranteed that when the pen falls down, the weight faces downwards, and a pen point faces upwards.According to the pen provided by the invention, by adopting the structure, the pen is simple in structure, when the pen falls down, the pen point faces upwards, and a refill is prevented from being broken. 种笔，所述笔尾部设有重物，重物需保证当笔掉落时，重物朝下，而笔尖朝上。本发明提供的种笔，通过采用上述的结构，其结构简单，当笔掉落时，笔尖朝上，避免了将笔芯摔坏。