Great tool for learning, studying and teaching! For an aesthetic medicine injector, an understanding of anatomy is essential. This model definitely helps with that. They are precise and I love how they are stacked on top of each other in a very well thought out process. However, the pieces can come loose fairly easily. If you have young children, DO NOT HOLD because you will lose a muscle here or there. I lost my right depressor browbone for 4 days and found it under a couch full of Legos. I like that you can still see the temporomandibular joint after removing the muscles, and the internal jaw muscles are also visible when the skull is rotated. Legs up. Overall a great product! I just wish the magnets were a little stronger.