Wire ball guide rail
Stern1 pinball machine .125" diameter wireform rail ball guide.
Stern Electronics, Inc. made pinball machines between 1977 and 1984 and their products are commonly referred to as Classic Stern or Early Stern pinball machines.
Stern Pinball, Inc. was established in 1999 and currently manufactures pinball machines referred to as New Stern pinball machines.
Most parts used by these 2 different companies and generations of pinball machines have different part numbers are not interchangeable with each other.