Came across these fun bits of paper recently! They are from the Ohio Chemical & Surgical Equipment Company; are a light weight card stock with lots of numbers and text on one side. The back is plain so what a perfect journal card, tag or anything you want to make!

There is a flip through here with examples of items I created with them:
https://www.youtube.com/watch?v=wgbusVJl3uY

They measure 7 x 3.5 inches and are a manilla file folder color.

Price: $5 per pack of 25 cards.