4-in-1 Math Roller Stamp Set includes the following features :

• Combines 4 essential mathematical operations - addition, subtraction, multiplication, and division - into a single, easy-to-use learning tool
• Features adjustable rolling wheels that allow you to easily change the numbers and switch up the mathematical equations, preventing children from memorizing the layout
• Engineered with a convenient ink drop port at the top, allowing you to easily add ink directly onto the internal roller wheels without getting your hands dirty
• Instantly creates a complete page of math drills in seconds, eliminating the need to manually write out practice sheets
• Crafted from durable, lightweight plastic panels that are perfectly sized for small hands to hold and maneuver
• Available in vibrant colors to suit different preferences

Material :

• ABS housing

Size closed :

• Size of 7.3 x 7.3 cm