1 tire line. 165/60R15 tires sized to your wheels and your car.

A 165/60R15 is 165 mm wide with a 99 mm sidewall (60 series) on a 15 inch wheel, 22.8 inches tall overall. A tire size only makes sense next to a wheel width and a car. 165/60R15 mounts on a range of widths, and the overall height decides whether the speedometer and the fender stay happy.
1 line carries 165/60R15, from Continental Tire. By type that is 1 all season. The tire has to stay near your car's stock height and mount on your wheel width, so pick the car and the wheel set and the page keeps only the 165/60R15 lines that do both.