Pen that is fit for multiple refill

The utility model provides a pen that is fit for multiple refill, including the pen socket, its characterized in that: be provided with a plurality of refill cassettes in its pen socket. The different cassette in position has the internal diameter of variation in size, and its effect is the refill that lets the external diameter be less than the cassette internal diameter, can pass through the cassette smoothly, and the refill that lets the external diameter be greater than the cassette internal diameter can not pass through the cassette to it can not be through the refill of cassette to fix. This invention lets length and the different refill of external diameter can replace the use each other, but has improved the replaceability of refill, has reduced user's use cost, has reduced the pollution to the environment. 本实用新型提供种适合多种笔芯的笔，包括笔套，其特征在于：其笔套内设置有若干笔芯卡座。位置不同的卡座有大小不同的内径，其作用是让外径小于卡座内径的笔芯，能够顺利通过卡座，让外径大于卡座内径的笔芯，不能通过卡座，从而固定不能通过卡座的笔芯。此发明让长度和外径不同的笔芯可以相互替换使用，提高了笔芯的可替换性，降低了使用者的使用成本，减少了对环境的污染。