Leuchtturm1917 Pen Loop Copper With Chemical Element Symbol Cu - Atomic Number 29
Leuchtturm1917 Pen Loop Cooper
The Pen Loop is not just functional and practical, it is the ideal to set accents. Printed the chemical element symbol of Copper Au and the Atomic Number 29 on to the sticker part. This is hidden in the book and can only be seen when opening the pocket in the back.