I keep all mine. I had a pretty good size container full, brought them to school last year (for those who don't know i'm an Auto Tech student), and all my classmates got a kick outta how strong they were...well needless to say half my stash was gone...come back for 2nd year and everyones using the magnets to stick their paperwork onto their toolboxes so they don't blow away from the fans blowing...made me feel good knowing i could help my friends out a bit.