Features:

• Abacus style abacus, plastic frame, 17 digits. A bead above 
• four beads below give a concrete visual representation of numbers by beads.
• A very useful tool in general mathematics education.
• The abacus also called a counting frame, is a calculating tool 
• where beads are moved down and be carried out by the feel and look at the beads, complex calculations.
• Note: Light shoting and different displays may cause the color of the item in the picture a little different from the real thing. 
• The measurement allowed error is +/-1-3cm.