Wooden Montessori Material Numerical Number Rods Montessori Early Math Learning Material Blue Red Color Home Version Ten wooden rods in graded lengths, 0.78*0.78*1.96in ~ 0.78*0.78*19.68in, half shorter than the professional version, painted red and blue in alternate segments; The purpose is to let kids experience the quantities of each number and to learn their respective names, to show that each number is represented by a single object; This series of rods develops visual discrimination of length, while height and width remain constant, it can teach kids to count from 1 to 10 through the rods; Great for homeschool teaching material, also could use at montessori kindergarten for early learning development; Your purchase is backed by our exclusive 30 day manufacturer warranty - we will offer a free replacement or refund if anything goes wrong with the product.