Si Manufacturing 100-Bead Rekenrek Teacher'S Demonstration, Color Change, 10 BarsThe Rekenrek Is A Great Visual And Hands On Teaching Tool For Learning Number Sense. Large Counting Frame Features 100 Plastic Beads In Red And White On 10 Rails. Color Changes After Each 5 Beads. The Upper 5 Bars Have 5 Red Beads On The Left And The Lowest 5 Bars Have White Beads On The Left. This Reinforces That 100 Is Composed Of Two Sets Of 50. Unit Measures 20 X 16 2 8 Inches.