This is a single Motorcraft Ford spark plug with the part number SP-525 (CYFS-12Y-EC). The spark plug is interchangeable with several other spark plugs, including ILTR6H8G, MOFSP525, 96870, XP5363, and E3.74.
The plugs came in great packaging with no damage, and even arrived earlier than expected.
I'm glad I checked the gap because my car is supposed to be at a 0.032" gap (which this product advertised it was), but all plugs came with a smaller gap of 0.023" when I checked them with my gauge.