SPIDER-MAN UNIVERSE #21 (2001) NM-

Comic grading can be subjective, but we do our best to grade each book honestly and accurately. To help you feel confident in your purchase, we’ve included clear scans so you can take a close look and decide for yourself whether you agree with the grade. We grade based on the industry standard, which is currently most popularized by grading companies such as CGC and is based off the original Overstreet Guide to Grading.

https://www.cgccomics.com/grading/grading-scale/