Description
The material used in PCB from top to bottom includes Silkscreen, Soldermask, Copper and Substrate. The last of those layers, substrate, is made of fiberglass and is also known as FR4, with the FR letters standing for “fire retardant.”








Combination Mini Plier
Sewing Machine
Drill Bit Set
Gears Pack
Adjustable Wrench Spanner
Ball Pein Hammer
Mechanzo Motor
Raspberry Pi 3 Model B+
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