I wanted to raise the pickup on my SG Junior just a bit and bumped into this product.
The spacers are not black as displayed in the picture. They rather look like pressed paper or wood with some lettering on it, so I assume it's some recycled material or so. It would not have been an issue for me if a native pickup cup had completely covered a spacer; however, 0.5 mm of material was still popping out from underneath a pickup cap, making it noticeable visually.
Also, the holes' alignment was not perfect; perhaps they tried to accommodate all types of dog ear P90, i.e., aftermarket ones and US ones. The material of a spacer is soft, so I guess you could still put a screw through it and make it work.
Conclusion: does the job but needs some tweaking, i.e., black/white sharpie depending on the colour of your P90 cap, holes alignment.