Practice counting, adding, and subtracting using the red and white beads, which are in 2 rows of 10 (5 red and 5 white in each row). The beads slide along the wires providing a great visual model for number concepts. Measures 9"L x 2.75"W x 3"H. Each Rekenrek includes an activity guide. Sold as a pack of 6 Rekenreks.