This 2 Pack of SD cards provides high speed and high capacity storage with 64 GB of space each. The cards are designed by Toshiba and are formatted to SDXC with a UHS Speed Class 3. They can read up to 260 MB/s and write up to 240 MB/s. Additionally, the cards are compatible with universal brands. The manufacturer offers no warranty, and the cards were manufactured in Japan. This product falls under the categories of Memory Cards, Cell Phone Accessories, and Cell Phones & Accessories.