Lexar SD Cards speed-rated at 40X provide incredible performance for video capture and other demanding applications. The most popular memory card form factor, Lexar SD cards have an erasure-prevention switch to keep your data safe for accidental over-writes or deletions. Record your high-resolution digital images and store other types of data safely and quickly with a sustained write speed of 6.0 MB per second*. Lexar Platinum SD Card 40X works with all SD Card compatible devices including cameras, camcorders, PDAs, and digital music players. Lexar SD Card 40X has a jewel case. It has a 512MB memory capacity.