The Rekenrek, or abacus, helps children build an understanding of number values and number representation. This 20-bead Sensory Rekenrek features grooved red beads, so kids don't just see red — they can feel it too. The grooves give all students an extra way to experience numbers and make this Rekenrek accessible for visually impaired learners. Size: 25 x 7.6 x 7.6 cm. Ages 4 to 5.