starter brushes?

[whistler84]

does anyone know what kind of a composite starter brushes are made of? i did a night hunt last night and believe i found one. says delco with a part number. was ging a nice clean solid vdi. cant recall what the number was though

 

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[whistler84]

i questioned it because its not magnetic^^^

 

[cudamark]

Most are a mix of carbon and copper.