What surface technology is the spot on the surface?

Looking at the picture, "Infik" appeared and searched the Internet. I found one in Jingdong. The model is not as cute as the author's. However, it has a good design point, that is, his pen can be hidden in the whole board, so that the whole product will not have additional protruding parts.

Clear organization, excellent products

I like this color scheme

Short oil, good oh ~ fresh color matching, neat layout.

Big guy's work, like

Great!

Great