These are a common pads used in entry-level cable / mechanical brake systems where callipers are typically without any branding branding such as those in:
Xiaomi M365 and copies that adopt the larger size brake pad. The easy way to determine if you have larger size is to note the absence of a tail (notch). The models that require smaller pads have a tail and use the Round Tail 18.5mm pad.
e-Glide G60/G120 scooters and many other standard cable/mechanical brake systems.
Easily identified by the round plate which is typically 21.6mm, shown below as 21mm by Electric Scooter Parts.
Supplied as a set (pair) two pads, one for each side. Order two sets for both front and rear.
Available in three compounds. To further understand merits of each compound, refer to the Brake Pads Category homepage.