A few things to keep in mind when finding artwork to print on a PopSocket:
Only upload PNG or JPEG.
A high res image with 300 dpi or higher is recommended.
We need bleed. Allow around 3mm of bleed.
The diameter of a PopSocket grip top is about 40 mm (1.57 inches). Extremely tiny text and details may not print clearly.
Due to the nature of dye-sub printing, extremely fine, thin lines will print slightly fuzzy. If this is crucial to the design, it might not be a great choice.
If your graphic has considerable design effects, such as: shine, gradient, glitter effect, foil effect, etc., expect that the printed result may vary from the image slightly.