This item is a pack of 4pcs solder finished prototype PCB boards, each measures 3cmx7cm for mounting components. Suitable for point to point DIY soldering.Because I build a lot of relatively simple projects (parts count, anyway), I needed some small boards for prototyping. Up until now, I had to buy relatively expensive larger boards and cut them down. These boards are great because they are small, cheap, and single-sided. You might think that the last item is a deficiency, but double-sided, plated-through holes take a LOT more solder. You also have to be careful with component mounting because the top side is live. If you have complex wiring you probably do need to have wires on both sides, but these are better for simple projects.Boards are exactly what I expected. They are not glass fiber epoxy boards, as stated in the title, these are a paper composite, and so behave a little differently. For starters they are not quite as rigid as epoxy boards, and that worked perfectly fine for my usage scenario. In addition, there’s a little drift when they drill the boards, such that the holes do not perfectly align with the copper layout for soldering. I should note, that every whole was within my tolerance, that stated, my tolerance had a large margin, I needed the holes to be somewhere in the neighborhood of the copper laminate. I did not encounter holes that were totally outside of the copper laminate, but certainly quite close to the outer edge, they were not perfectly The boards are not tinned, but a little buffing to take off any oxidation .