產品特色
- 筆芯顏色：單支筆內建黑、藍、紅、綠四種顏色，按壓式切換非常方便。
- 筆尖規格：走珠尺寸為 \(0.7\text{ mm}\)，書寫流暢。
- 設計：採用透明桿設計，方便隨時查看墨水量；部分款式帶有舒適的軟膠握
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