Item Type: Dice_x000D_ Product Material: Plastic_x000D_ Color: Black and White_x000D_ Weight: Approx. 92g / 3.2oz_x000D_ Application: Math Teaching_x000D_ Product Size: Approx. 1.6x1.6x1.6cm / 0.6x0.6x0.6in 1Surface Text: The text on the surface of the dice is numbers, and the numbers on the dice will not wear out and are durable. 2Develop Intelligence: A hands on way to practice basic math skills. Develop children's intelligence for early childhood education. 3Plastic Material: The positive and negative number dice is made of plasric, which is waterproof and wear resistant, and can be used for a long time. 4Math Teaching: You can practice advanced math calculations using both positive and negative numbers. 5Good Workmanship: Exquisite workmanship, beautiful appearance, small and portable size, providing you great using experience.20 x Dice1. Please allow 1?3cm error due to manual measurement. Thanks for your understanding._x000D_ _x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.