We are wholesales of bulk Flash memory Card, ready goods both in HK and China Mainland, our main back code are TC58/MM memory card which are the grade A quality OEM Micro sd card. We support 3years warranty for good die quality goods.Let me introduce you our garde A quality goods here, U3A1 Micro SD Card Series are a smart digital storage device based on grade A flash memory. Vicco U3A1 class rate Micro SD memory card supports write speeds up to 50MB/s and read speeds up to 95MB/s.