Make learning math fun with our engaging Plus Minus Dice Set! **Key Features:** * **Engraved Symbols:** The plus and minus symbols are deeply engraved on the dice surface, ensuring they won't wear off even after extensive use. * **Durable Plastic Material:** Crafted from premium plastic, these mathematical operation dice are built to last, resisting damage for long-term enjoyment. * **Intelligence Development:** An excellent tool for early childhood education, these math calculation dice play a supportive role in developing children's intelligence and numerical skills. * **Attention-Grabbing Design:** The classic dice shape is highly effective at capturing children's attention, encouraging active participation in mathematical operations. * **Perfect Educational Toy:** This plus minus dice set is an ideal toy for children, providing entertainment while simultaneously teaching fundamental mathematical concepts. Each set includes 20 dice, each measuring 1.6x1.6x1.6cm (0.6x0.6x0.6in) and weighing approximately 80g (2.8oz). Perfect for math teaching and playful learning!