They're OliBlock magnetic clips, and it looks like the shop just sells them through Etsy. These are opened flat out, but when they fold over, the two fat parts are magnets that hold the papers between them together. This particular screenshot is the Gradient 5-pack. There were some cute floral ones too, but they must have been bigger, as it was just a single one sold at a time.
There were several fun, bright colors. Being on Etsy, it looks like the availability may change regularly, so I wouldn't get my heart set on a particular color ;)