I appreciate black housing for its understated style, which keeps the focus on the wiring and layout.
OBD1 to OBD2 Adapter Cable for Honda Vehicles OBD2 16Pin to OBD1 3Pin OBDII Car
You will find that these relays come in a sleek black color, blending discreetly into most panels without drawing attention.
A nice touch is the black housing, which gives the relay a simple, classic look on the panel.
A nice touch is the matte black look, which reduces glare when you view the board from an angle.