One and Two, and Plumbing Level One. Our membership director uses the color books as a marketing tool.
Contractors are very impressed with the look and content of the materials.
To the best of my knowledge there is no other product on the market that comes close. When I opened the new full-color Core and Electrical books I knew instantly that I was going to love them. The illustrations accurately depict what the students will see and work with in the field. It's easier to coordinate instruction when you have the trainee material within the Annotated Instructor Guide. I particularly like the new sidebar features, including the Caution and Warning boxes.