This is a set of 6 NGK BPR6ES (7133) spark plugs which will fit any Datsun S30 or S130 Z-car (240Z, 260Z, 280Z, or 280ZX).
Note that for an S30 Z-Car (240Z, 260Z, 280Z) you can either use these plugs, or BP6ES plugs, which do not contain a resistance band. In an S30, a resistance band is not really necessary, while the 280ZX requires a spark plug with a resistance band to protect computer controls from interference caused by radio interference. The BP6ES is discontinued by NGK.