ETA hand2mind Plastic, Assorted Colors, Cuisenaire Rods Wooden-Alternative Introductory Set with Tray (Set of 74) Teach key math topics such as - addition, subtraction, multiplication, division, fractions, geometry, & counting Help children learn important math concepts as they progress from concrete representation to abstract thinking 10 color-coded rod lengths, ranging from 1 cm to 10 cm Plastic rods are durable and easy to clean Includes one set of Cuisenaire Rods, 74 pieces total, and an organizing tray