I first bought these...
, July 21, 2013
I first bought these mechanical pencils back in the early 90s when I was in
college for doing mathematics and engineering homework. The Pentel Graph PG500
series pencil is an older model that holds up and performs well as I can attest
to. The last one I had lasted for almost 20 years but was recently lost. Very
glad to see they are still available.