Abacus, 15 Digits for Children, Solovan, Math Board, Elementary Students, Learning, Combination, Kumin, Cram School, Beginners, Beginners, Abacus. This is a set of 2. Recommended for beginners as an introductory to calculators. Great for home practice of problem collecting. ※There may be chipping that may occur during manufacturing without impairing performance. For children, Soloban, Calculation, Elementary Students, Math Students, Study, Segmentation, Clamming, Beginners, Beginners