1) Find the Pencil...
You'll need to go to https://www.tinkercad.com/things/hXmnUVBf6kG
Where you will find my render of John Wick's Pencil. My Version even has a grip at the end of the pencil for better cosplay, if that is what you desire...
I did the best I could to recreate the pencil...
2) Buy A 3D Printer or go to your school or workplace, and ask to use their 3D Printing Service
3) Print out the pencil and spray paint it Silver
Have Fun and stay tuned for better versions of the Pencil
Edvardi Gaston