Description: The math rolling stamp is easy to carry and can be reused after adding ink. You can quickly print math problems by rolling the stamp. This math practice stamp can meet all the addition and subtraction numbers of 1-100 and cultivate children's logical calculation ability. It would be a fun and meaningful gift for your children and friends' children. It is constructed of plastic material. The length of the math roller stamp is 7.6cm, the width is 6.4cm, and height is 3.2cm. It is a great educational toy for both boys and girls. Item Name: Math Roller Stamp Material: Plastic Single Replacement Ink Capacity: 3ML Features: Educational, Double Roller, Interesting Teaching Size Details: Size: 7.6cm x 6.4cm x 3.2cm/2.99" x 2.52" x 1.26" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Color Yellow/Pink/Blue/White: 1 x Math Roller Stamp or Color Black: 10 x Replacement Ink