Do you want to practice your math? Do you want to improve the computing speed and calculation ability? If yes, please consider choosing this product. Our product is a practical roller stamp, including 2 bottles of ink. With the help of it, your interest in learning math can be cultivated. Features -Color:Pink -Material:Plastic, Ink -Size:7.00X6.00X3.00cm/2.75X2.36X1.18in The package includes a addition subtraction match teaching stamp and two bottles of printing ink. The stamp uses double-sided design, one is addition stamp, the other is subtraction stamp. The math learning roller stamp has clear stamping, thousand of impressions without losing the original quality. Math problem can be easily changed by turning the wheel, which can satisfy all addition and subtraction within a hundred. With compact and lightweight design, this math learning stamp can be placed in a stationery bag or school bag at any time. Package list: 1 x Math Roller Stamp 2 x Bottles of Printing Inks