Product Features: [Improve Skills]: This Calculation Practice Pad provides various permutations and combinations to practice their to solve problems.Number teaching roller set: adjustable numbers, gentle rolling, you can freely combine 5100 mathematical problems within 1-100. Comes with 1 organiser bag, 2 whiteboard and 1 erasable cloth. This classroom stationery set is a and meaningful gift for your child or a friend's child [Ergonomic Design]: It features an ergonomic shape that makes it comfortable to use while still ensuring that children are to practice their problem-solving skills effectively. [ of Problems]: The pad includes a of problems and challenges that help children develop their skills in problem-solving, basic operations, and data analysis. [No Paper or Calculator]: This pad is a great way for children to develop and practice their skills without having to use paper or a calculator. [ and Safe Environment]: With the Calculation Practice Pad, children can learn and practice in a and safe environment. Color: White Material: ABS Package Contents: 5 x Addition and subtraction dual- arithmetic board 10 x whiteboard markers in random colors 5 x Portable fleece bag with random color 5 x Wiping Cloth (Random color, 't accept the specified color.) Only the above package content, other products are not included. Note: Light reflection 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.