Description :-
It sounds like you're describing a Montessori learning material known as Number Rods, which is a tactile and visual aid designed to help young children understand numbers, counting, and the concept of length. Here's a more complete description based on what you provided:
Number Rods are a set of wooden rods, each divided into alternating colours of red and blue. The rods increase in length from 10 cm to 1 meter, progressing in ten equal steps. Each rod represents a number from 1 to 10, with the length of the rod corresponding to the value of that number. The red and blue sections help children visually distinguish the units.

The rods are often used to teach a variety of concepts, including:
Counting: Children can physically count the units on each rod and match them to their corresponding numerical value.
Comparing sizes: By laying the rods side by side, children can compare which is longer or shorter.
Number recognition: The sequence of colours helps children recognize number patterns visually.
 Addition and subtraction: The rods can be used in more advanced exercises to demonstrate the concepts of adding and removing lengths.
The Number Rods are an excellent Montessori tool for developing a child’s early number sense and understanding of basic mathematical operations in a hands-on and concrete way. The visual and tactile nature of the material engages children in active learning and helps build a strong foundation for later mathematical concepts.