Colored lower arches (also known as aprons) for Stern pinball machines. Comes in a variety of colors.  Choose color from drop-down menu above.
If converting from a metal apron you may need to drill 2 mounting holes in your playfield (some playfields are drilled, others are not depending on the era). You will also need a metal spacer kit, see link below.
Stern reference numbers SP46 (general part number for all colors), 545-9953-02 (red), 545-9953-05 (blue), & 545-9953-07 (orange).