Brand new, homeschool, science curriculum from a Christian perspective. Teacher Guide is paperback, 4 texts are hardback. 7th-12th grade. Never used because I changed my mind on what science subject to teach. I currently have 2 sets! Check out a sample of this curriculum at masterbooks.com/general-science-1-survey-of-earth-sky-curriculum-pack Currently, a complete set is sold for $82.35 on the MasterBooks website.