These cubes were exactly what I was looking for! They are as expected smaller cubes with clear laminated slots for inserting cards. I have not used them yet in my classroom, but they seem durable enough. I appreciate that the product comes in a nice plastic "bag" for easy storage. It also comes with an instruction booklet that provides several example lessons and a pattern template for the card insert. I am so excited to start using this product as it can be used to teach just about anything!