Review on Promaster 128GB Rugged UHS II Memory by Johnny Nguyen

Comparable to Sony long-life memory cards. It's v90, which means a minimum write speed of 90MB per second. This is what you need for 4K or 1080p videos at 100 MB/s. I've had 2 of these in my Sony a73 and a7r3 for the last 6 months or so. You haven't let me down yet. Pro Master also comes with an insane guarantee! If they break, you can get a replacement in the mail within about 72 hours. Pretty cool. I love my. Have used them for weddings, receptions, engagements and multiple shots on one card and never lost a picture or had any problems. If the Sony is more expensive or sold out, this is a solid alternative.