SUNKEE5 pcs FR4 Prototype PCB Panel Universal Circuit Board 10x15cm Single Side

As others have mentioned, these look like rejected boards. They arrived filthy and scratched. Dirt and oil I can cleanup, but some of the scratches might be an issue. A couple of boards have scratches that run the length of the board so it may be impossible to work around in some cases.

Very low quality boards. Deep scratches, and lots of them. Fat fingerprints all over. Hopefully they are not deep enough so it is still etchable. But substantial cleanup effort, and polishing some down, will be needed to make them usable.

Boards were oxidized along one edge, splotchy, and had streaks and stains throughout.

All 5 pieces were severely scratched and were very dirty. They appear to be rejected product that was packaged up and sold cheep. The scratches were so bad that etching was impossible.

Good product

Perfect size I've made lots of stuff using these boards but I wont tell anybody till I'm gone dont want to disappear wahaha

Just what I was looking for

These boards are very durable but the downside is that they dull out every drill bit I use on them when I make the holes for through hole components.Some of these boards have stains on them, but that is no problem, you can remove that with steel wool; no problem.Overall this is a good product but if you are going to use high speed steel drill bits to put holes in them, expect to only drill about 20-30 holes before your drill bit is toast.