... offering the most competitive prices.2. Superior quality, each USB flash drive undergoes stringent testing to guarantee its memory space and writing ... to Shenzhen Worthspark CO.,LtdShenzhen Worthspark Co.,Ltd. is USB Flash Drive and power bank developing, manufacturing and marketing company. After ... we will move to mass production.6. What is the brand of your USB chip ?We usually use Toshiba, Samsung, ...