Samsung MB-MS4GA, 4 GB, MicroSDHC, Class 4, 24 MB/s, 7 MB/s, Black Samsung MB-MS4GA. Capacity: 4 GB, Flash card type: MicroSDHC, Flash memory class: Class 4, Read speed: 24 MB/s, Write speed: 7 MB/s. Product colour: Black Samsung’s latest MicroSDHC memory card is apparently shock, dust and waterproof, as well as X-ray and magnet-safe; never ones to back down from a challenge, we put the card through its paces to see if its claimed durability would hold up after a set of... Quick, good value and tough - a great memory card ...