Feature:1. Wide Application: Teaching dice set is suitable for classroom accessories, home teaching and math learning, it can also be applied to parties or playing with friends at home or at school with classmates indoors.2. Compact Dice: The dices are 16mm in size. The compact size make it convenient for you to carry. You can put them in your pocket or bag.3. Easy to Read: Teaching dice is printed with clear signs, including minus signs and plus signs for easy reading and easy to identify geometry.4. Engraved Symbols: The mathematical symbols on the dice are engraved, and the symbols on the dice do not wear out and are durable.5. Plastic Material: Made of premium plastic, the math operation dice are odorless, light in weight and resistant to wear and tear. It has a long service life.Specification:Item Type: Dice SetMaterial: PlasticWeight: Approx. 84g/2.96ozSize: 1.6x1.6x1.6cm/0.63x0.63x0.63inApplication: Math Teaching .Package List:20 x DiceNote:1. Manual measurement, please allow 1‑3mm error, thank you! 2. Due to differences between different monitors, the picture may not reflect the actual color of the item.3. Children should be used under the care of parents.