My fiancé is a LRC teacher, had asked me to whip something up for her class to use for their fractions kits! as to be easier to get the piece you are looking for without digging through/dumping out the small bag they came with!

 The kits in question should be

HMH - Houghton Mifflin Hancourt. Math 180. Scholastic. 

That's what I was given anyways haha 😄 

putting in a Second option for the thicker cardstock/cardboard tiles!