It's a 5.5x3.5 Inches High Quality General Purpose Printed Circuit Zero Board. This is commonly known as Perf Board, Practice Board, General Purpose PCB, and Zero Board. The plated holes are pre-tinned/pre-coppered and very solid, making them very easy to solder components on. It is Widely Used For Electronic Projects.
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(Note: Product Image are shown for illustrative purposes only and may different from the actual product)