![It will strengthen your heart !? I tried three companies' "unbreakable" mechanical pencils [our stationery box]](https://image.enuchi.jp/upload/articles/2236/36f275cec71472a2e52f4bad522dca4f_special.jpg)
It will strengthen your heart !? I tried three companies' "unbreakable" mechanical pencils [our stationery box]
Is it natural that the core can no longer be broken? I actually tried three mechanical pencils, "Delguard", "Orens", and "Oh Reine Shield".
