Uncover the mysteries in unique minerals with this Mohs Mineral Science Kit. Little scientists will love testing, classifying, and identifying various minerals with this incredible science kit for kids! Great for science classes and more. Each kit includes 1 introduction guide, 1 magnifier, 1 nail, 1 streak plate Materials vary. (13 pcs. per set) Box, 7" x 1 1/2" x 4 3/4".