I highly recommend that you buy the wooden Cuisenaire rods. The precision of the lengths is better than the plastic ones. This particular set is beautifully made and comes in a clear plastic container. The assortment is a good one for multiple uses of the rods. I bought a second container for tutoring once I saw the quality. This basic set was later developed into the Dienes Blocks, also called base ten blocks, wherein the color pattern continues using the white one rod and the orange ten rod. I recommend buying base ten blocks that build on this color system to make understanding the relations among numbers more easy.
If Cuisenaire rods are new to you, you are in for a treat. As a modeling tool for arithmetic, they are beyond compare. When using them to represent the numbers one to ten, children see and feel relative length and learn measurement in centimeters. Instead of the flawed flashcard method for memorizing facts, lining up the rods beside a meter stick shows the learner exactly what 5+3 or 3+5 looks like. For multiplication, the rods are extremely valuable for showing that eight yellow rods is not the same situation as five brown rods though they are the same total length (8x5=5x8). Beyond this, the rods can represent fractional parts and are useful for making models for area and volume. On YouTube there is a remarkable video of Gaetagno working with Montreal first graders in 1963 that begins to show how Cuisenaire rods can encourage high level thinking in very young children. The Miquon books are helpful resources for using these rods. For those of you who work with the Singapore block diagrams or the Math Playground Thinking Blocks activities, the Cuisenaire rods are invaluable aids for representing word problems. Music teachers can use the rods in measure groups to "annotate" simple rhythm patterns brilliantly. Strongest recommendation.
Teaches students Common Core Skills such as fractions and measurement with real-world representations. 155 wooden rods in 10 different colors. Each color represents a different rod length (1 cm – 10 cm). Enough rods for 4-6 students to use at a time.