Crafted as a tool for abacus mental arithmetic, this 15 rods 7 beads abacus is for both beginners and advanced learners. Its design ensures long-lasting use, while the clear bead arrangement aid in quick and accurate calculations. Features -Color:Black -Material:Plastic -Size:27.00X11.00X2.00cm/10.61X4.32X0.79in -Efficient reset mechanism: the abacus is equipped with a onekey reset function, simplifying the process of clearing calculations and saving time during practice -Optimal for children: with a design that includes 15 rods and 7 beads per rod, this abacus is ideal for children, helping them understand and enjoy arithmetic -Dedicated mental arithmetic tool: this abacus is specifically created for mental arithmetic, supporting the development of children's calculation abilities and logical thinking -Robust and reliable: constructed with plastic materials and fine craftsmanship, this abacus is and dependable, ensuring it withstands regular use -Userfriendly for beginners: the abacus's simple design makes it easy for beginners to up and use, providing an accessible into the world of mathematics Package list: 1 x abacus