The SSD Review published a review on the Samsung EVO Plus microSDXC UHS-I Card (256GB) ? So Much V-NAND! A quote from the article:

Released earlier last year, the Samsung EVO Plus line of microSD cards has been quite a success. In light of this, Samsung has decided to continue momentum and push boundaries by expanding the capacity availability. Today, Samsung has released the world's largest microSD card, and in order to do so, they have integrated their latest 48-layer TLC V-NAND into it! At 256GB, it is more capacity than some laptops and now you can have this kind of capacity in your phone or tablet, action cam, or any device that accepts microSDXC cards!

 Samsung EVO Plus microSDXC UHS-I Card Review (256GB) ? So Much V-NAND! @ The SSD Review