The ETA Hand2Mind Density Blocks Set is a fantastic tool for teaching students about measurement and density. According to my experience, the set is well-designed and easy to use, making it perfect for both experienced teachers and beginners. The blocks are sturdy, and the variety OF shapes and sizes allows for plenty of experimentation. The only con is that the set doesn't come with any sort of storage container, so it can be a bit difficult to keep everything organized .Overall, I highly recommend this product for any Industrial and Scientific classroom..