ETA hand2mind Plastic Jumbo Cuisenaire Rods Classroom Bulk Kit (Set of 154) 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 2 cm to 20 cm Plastic rods are durable and easy to clean Includes 154 Jumbo Cuisenaire Rods, organizing tray, and mats