All of our usb memory sticks use A grade brand chips with high speed like Sandisk, Hynix, Toshiba, Intel etc.
For 2.0 usb keys some high end clients need much higher speed than usual, don't worry! We have chips which can reach writing 10M/s and reading 20M/s. Below is testing screenshot for your reference:
For 3.0 memory is starting from 8GB, usual speed pls check as follows, if you have much higher speed request pls contact with us separately.