ETA hand2mind Wood Cuisenaire Rods 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 Wood rods are durable and are made to last Includes one set of Cuisenaire Rods, 74 pieces total, and an organizing tray