PROMASTER VELOCITY MEMORY CARDS are for photographers and videographers with the need for speed The 100MB/s write speed is perfect for recording clean, uninterrupted video at todays super high resolutions. Want to shoot still pictures in high-speed burst mode? Go ahead. Velocity memory can keep up with your cameras high frame rate, even set to RAW. The blazing fast 285MB/s download speed quickly pulls large files into your computer or video editing suite.Secure Digital1900X285MB/s Read Speed100MB/s Write SpeedUHS-II Speed class 3, U3UHS-I backward compatible