Small Numerical Rods with Number Tiles,2 Sets Montessori Numerical Rods Number Tiles Two sets of ten small wooden rods divided into units by alternating colors of red and blue. The rods are constant in height and width (1 cm) while graduated in length from 2.5 cm to 25 cm. The rods are presented in a wooden box that includes one set of wooden number tiles 1-10. Similar to the Large Numerical Rods. But, this small number rods that comes in set of 2 is used for addition and subtraction. It is a great time using them to build ten. Perfect for home-schooling.Great tools for kids.Perfect size for the shelf at home and for preschooler to work with.It seems so elementary, but the visual and the touch are so much a part of early learning.With Number Rods, counting here is more linear and sequential.Counted from one to ten (going up) and counting backwards (going down).Here the child learns that the longer rods relate to big numbers and shorter rods relate to small numbers. The set comes in a compartmentalized wooden box with a lid for convenient storage.  Also available is the Mini Numerical Rods set, which is slightly different in size.