[問題] Pentel 極速鋼珠筆筆芯差異
想請問各位大大,Pentel極速鋼珠筆出了超多種筆芯
LR LRN LRP 還有KFR
後面字母應該有甚麼意思吧 差別在於? 都可以共用嗎?
另外還有一個PENTEL德拉迪塑膠鋼筆
TRJ50 跟 MLJ20有差別嗎 因為價錢好像不太一樣
跪求各位大大解答
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