I have already been several articles talking about various accessories for a MacBook Pro Retina with Touch Bar that I plan to purchase, but since I am going to sell my MacBook to a co-worker who uses SD cards a lot, I have been searching the net for some options that allow him keep doing the work you did with your Macbook Air in terms of the speed of reading your SD cards.
The 12-inch MacBook only has a USB-C port, so everything we want to connect to it must have this port and therefore to be able to read the SD cards we will have to look for an adapter.
The Apple adapter does not have the ability to read SD or microSD cards so you have to turn to third-party manufacturers to find them. In this case the one that I propose you to see today is very simple and comes in all four color shades that Apple sells MacBooks in 12-inch, although, as you may already know, they are beginning to eliminate from their color range the two gold tones, both gold and rose gold. We'll see how long will they keep this color gamut that already with the current MacBook Pro has disappeared being reduced to silver and space gray.
But hey, what I really want is that you have a new possibility as far as adapters are concerned. Regarding the manufacturing materials, we have anodized aluminum and plastic that give it firmness. As for the ports it adds to the MacBook we have a USB 3.0 input, SD and microSD card slot and a microUSB input.
It costs $9,46 and you can know more about it this link.