A wonderful tool that aids in teaching the various operation signs and what each operational purpose is. This set of 12 dice features the following operations on each die: < , > / and =. Specifications: - Age: 5 Years and older - Item Size: 1.6 cm - Material: Non-Toxic Plastic Warning: CHOKING HAZARD-Small parts. Not for children under 3 years EDX products are tested for compliance with EN71, ASTM and CPSIA standards. All EDX products meet the ISO 9001 accreditation requirements. EDX is committed to becoming carbon neutral through re-using, recycling and improving energy management. What's in the box 12 Operation Dice