This is a great set of laminated (almost a plastic feel) flashcards, making them easy to hold and read. The cards themself are a good size making them easy to read. They cover the four basic learning functions in math, addition, subtraction, multiplication, and division.Each pack of cards has 50 cards with math facts on both sides of each card. The multiplication and division cards don't waste time with the zero functions, but the multiplication facts only go up to 10. Each set comes in its little box (typical box for cards) but then the whole thing comes in a nice carrying box with handle. The one thing that I found is when the cards are on the ring they do not fit in their little boxes, so I cut the top of each box off so that the cards could be in the box with the ring. (see photo) This whole set is great for traveling with the carrying case and rings to keep the cards together.These cards come with a small hole in each and a ring for each set that KEEPS them all together yet lets them be flipped around nicely. With the ring, they will stay together and last longer than normal paper cards. The ring is easy to put on and take off so that you can shuffle the cards and use them in random order as well.I think my favorite feature of these cards is that there are equations on both sides of the cards because the answer is on the bottom right corner of each card and easily covered from view by holding your finger over it. I use these cards with my grandsons. Even though the answer is on the front is not conducive to the 7-year-old using them individually, for the four-year-old using them as sight in learning they work great cause the whole problem is right there.