At the McAllen Marathon, I saw an acquaintance who used safety pins to attach his race bib to his shirt. It's a common sight, but it pained me. It was a really nice shirt. 

Fortunately, his birthday was in a few weeks, so I corrected the problem with some RaceDots.

RaceDots are (really) powerful magnets you can use to attach your race bib to your shirt without poking holes. I first heard about RaceDots during the company's KickStarter campaign. 

As with any new gadget, I was super paranoid when I first used them. Before the race even started, I thought I lost one. I found it attached to the metal picnic table I was sitting on.

Overall, I'm really happy with them. Fair warning, though, sometimes a pair on one of the top corners of a bib will latch onto a set on the bottom. It doesn't always happen. I fidget a lot and am usually adjusting my hydration belt, so that's probably what causes that issue.

The front of the dots look like buttons and the backs are like washers. Once again, they are strong magnets. Sometimes, I need to get help separating the backs, when they get stuck together.

I've gotten into the habit of just using three of them (two at the top corners of a race bib and one at the bottom center).
My original set included five. That was great, because I did lose the backs of one of them. 

The company gives the option of ordering just backs. When I bought the birthday gift set, I ordered a replacement back part. RaceDots included two backs (maybe they had trouble separating them also) and an extra RaceDot in my order. (Thanks!) It's the skull and crossbones in the photo.

They have different design options and offer custom design options too. Save your favorite running shirts. Check out RaceDots.com. #DontBeAPinhead