These cloths are a collaboration between members of the Canadian Fountain Pen Enthusiasts Facebook Group, & penablers. Manufactured by Nerd Wax.
From the manufacturer:
Our Jinkies Collection is made from the Highest Grade Microfiber money can buy!
🧑🍳 💋 So they clean so much better than those free ones you get with your glasses.
♻️♻️ They’re also made from 100% Post Consumer Recycled Materials ♻️♻️
The smaller one measures approximately six inches square.
The larger one measures approximately seven and a half inches square.