A complete set of Feynman lectures in a well presented boxed set. The pepper quality could have been better as Ther is a risk of tears when handling the pages. You have to be careful in overall handling. The lectures are as executed very well presented with Feynman's unique style. A basic background in Quantum Physics would be good as well as ensuring your maths is up to it. But, you still understand the concepts and ideas. Highly recommended.