Description: Product name: 2 in 1 Multiplication and Division Roller Seal Color: white Stamp size: 7.6x6.4x3.2cm/2.99x2.51x1.25inch Model: Addition and Subtraction 2 in 1 Blot: 2.4x0.4cm/0.94x0.15inch Material: ABS Package: 1pcs*Roller Seal Warm Tips: 1.Due to the light and monitors effect, colors may have lightly difference. 2.Please allow slightly size errors due to manual measurement. Thank you for your understand! 3.1mm=0.039inch. ✅【Digital Teaching Stamp Roller】 Adjustable numbers, gently scrolling, Can efficiently and quickly print out less than 100 math problems. A fun and meaningful gift for your child or your friend's child! ✅【High-Quality Material】The math roller stamps are made of sturdy ABS plastic,and the housing is durable. The math problem can be changed by twisting the roller lightly, and the math problem is random. ✅【Improve learning efficiency】You can quickly prepare math problems for your children at home, just roll the stamp, and you can quickly print the math problems, and it dries quickly without dirty hands, which is convenient and practical. The permutation needs to be changed every 10 math problems to avoid repetitions. ✅【Perfect Educational Gifts for Kids】keep the kids busy and get yourself a moment of quiet when they need it. So, it's a great gift for our kids and even for parents. ✅【Quick calculation ability training】Rotate and adjust the column type, can adjust 10 different queue methods. Satisfy all multiplication and division numbers from 1-100. Develop children's logical calculation ability.