The SKU is the code used to identify your model, its size, color, and so on. It's usually a combination of 4 to 10 letters and digits.
You can find the SKU in the box in which you received your product. These are some examples of SKU codes:

PX2CL107 - Pulsar X2 CrazyLight Jet Black

PXV3ES23 - Xlite v3 eS Wireless [RED 3000] Size2
PMP11XLR2 - ParaControl v2 Mouse Pad XL Red (490x420)

ES70HE21B - Pulsar eS HE 70 ISO Black
Alternatively, for mice and keyboards, you can find most SKU here, under the MOUSE / KEYBOARD section: pulsar.gg/register
If you have any questions, please feel free to contact us through pulsar.gg/support.