Key features extreme speeds for burst shooting fast transfer and 4k uhd up to 40mbs write speeds for fast shot to shot performance 16gb 64gb up to 60mbs write speeds for fast shot to shot performance 128gb256gb uhs video speed class 30 rating ready for vr and 360 video recording built for and tested in harsh conditions take your shots to the next level extreme speeds to catch your best shots plus uhs video speed class 30 v30 and uhs speed class 3 u3 ratings deliver the video r