The black core paper has a black layer inside the card making it very hard to shine light through it to see what card it is from the back side of the card.
You will also have access to the bonuses I create. This is my way of showing appreciation for your support. You can access them through this link: http://bonus.golangmarket.com/
The Gopher is a variation based on the Go mascot designed by Renee French which is licensed under CC BY 3.0.
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