Number Sticks use different length and colours for counting in size. Sticks range from 1-10cm. Includes 11 counting sticks in 10 colors , 2 in yellow, number length, color puzzle and development game. Each color represent one size, example White is 1cm, Red is 2cm, and so on. Trains children to use counting, and size and color sensory congnition. Developing children's basic math, concentraction and hand-eye coordination. Feel free to mark a number on stick with pen, and use it to teach children addition, subtraction, number counting, multiple, order of numbers and sizes, etc.. Suitable for 3 year old and above.