![Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post](https://cdn.i-scmp.com/sites/default/files/styles/square/public/d8/yp/images/pencil-yellow.jpg?itok=ipVe2udK)
Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post
4-Color Multi-Function Ballpoint Pen, Retractable, Medium 1 mm, Black/Blue/Green/Red Ink, Randomly Assorted Barrel Colors - BOSS Office and Computer Products
![Amazon.com: BIC BU3 Grip Retractable Ballpoint Pen, Medium Point (1.0mm), Black, Side Click Retraction For Added Convenience, 18-Count : Everything Else Amazon.com: BIC BU3 Grip Retractable Ballpoint Pen, Medium Point (1.0mm), Black, Side Click Retraction For Added Convenience, 18-Count : Everything Else](https://m.media-amazon.com/images/I/81HlZf6BPFL.jpg)
Amazon.com: BIC BU3 Grip Retractable Ballpoint Pen, Medium Point (1.0mm), Black, Side Click Retraction For Added Convenience, 18-Count : Everything Else
![Amazon.com: BIC BU3 Retractable Ballpoint Pen, Medium Point (1.0mm), Black, Side Click Retraction For Added Convenience, 36-Count : Everything Else Amazon.com: BIC BU3 Retractable Ballpoint Pen, Medium Point (1.0mm), Black, Side Click Retraction For Added Convenience, 36-Count : Everything Else](https://m.media-amazon.com/images/I/51cTQavofXL._AC_UF894,1000_QL80_.jpg)