Monomad: manual calculating tool

Hello black and white. Meet me again @asklanbudi

As usual I will share some black and white versions of my portraits for all my friends.

The photo I want to share is a calculating tool.
This calculating tool is often used by elementary school children.
This tool is made with plastic in a round shape.

I today have several photos of the tool.
I took several photos with my cellphone and assisted with a macro lens.
Then I edited it into a black and white version.
Friends, you can take some photos below:

I'm going to put this (manual calculating tool) into a daily #monomad contest organized and curated by @monochromes

This is all I can share with friends, I hope black and white friends like it. Greetings from me @asklanbudi