If you were a '90s girl [1], then a slap bracelet on your wrist was a given. We thought we knew everything there was to know about these springy bands, but then Reddit's /r/mildlyinteresting [2] subreddit blew our freaking minds. Apparently, our favorite wristwear is made of a very obvious everyday household object. All our editors let out a collective, "DUH" when we found out. Can you guess what it is?

Recycled Measuring Tape!

Reddit user minormorin [3] took apart a slap bracelet and revealed that they're made of recycled measuring tape! What. So, now you know. The magic of the slap bracelet has officially been demystified. Now, whenever you need to measure something that's about seven inches long — just bust out a snap bracelet.