There's a Reason For Holes on The Tops of Pen Caps, And It's Surprisingly Awesome : ScienceAlert
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Pen Blue No Cap, 3D - Envato Elements
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The Cap | Fountain Pen
Why Do Some Pens Have Holes in Their Caps? You'd Have Never Guessed the Reason
Why Pen Caps Have Holes in Them - ATTN:
The Reason For Holes on The Tops of Pen Caps Is Surprisingly Awesome : ScienceAlert
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Platinum Slip & Seal Cap: What Is It and Does It Work? — The Gentleman Stationer
