ETA hand2mind Plastic, Assorted Colors,  Cuisenaire Rods Wooden-Alternative Introductory Set with Tray (6 Sets of 74 Pieces) 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 six sets of 74 Cuisenaire Rods and an organizing tray