42pcs Solderless Double-Sided Protoboard Universal PCB Board Prototype Kit Electronic Bread Disc with 6 Sizes (2x8 3x7 4x6 5x7 6x8 7x9 cm) for Arduino DIY Project

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42pcs Solderless Double-Sided Protoboard Universal PCB Board Prototype Kit Electronic Bread Disc with 6 Sizes (2x8 3x7 4x6 5x7 6x8 7x9 cm) for Arduino DIY Project