Usually 65lb to 110lb weight to provide structural integrity for folding and gluing.
In technical automotive guides, such as on the Tacoma World forums, a photo with this name illustrates the use of to clean transmission pans and magnets. How to identify your specific file:
You likely just need standard glossy or matte inkjet photo paper to print it.
Could you describe ? That would help me pinpoint exactly which paper or project it belongs to.