A set of 4 tins each containing 20 cards with notes for and discussion of different experiments . Graded - the red tin is beginners, say 7+ year olds, then orange, green, blue, for 11+. 14cm by 10cm tins contain 20 cards with the instructions (but not the gear) required,. The series is based on simple items the average household will have - baking powder/vinegar, glasses of water, salt, Ideal for the junior or budding scientist. This series stresses the fun/magic side of science.