Features:Suitable: The dice can be used as a hand on tool for learning and reviewing mathematical concepts for students at kindergarten and above. Rounded edges are safer and do not cause injury.Write On and Wipe Off Design: This design allows the dice to be used repeatedly, and the dice are designed to be blank with no numerical markings and can be written and wiped.Appearance Design: The dice are cubic, best for inspire children about geometry. The colors are bright and vibrant, so can attract the attention and can teach kids to identify colors.Multifunctional: You can write numbers on the outside to use as a game dice, and also can write letter and numbers on the outside and do number crunching for children in lessons.Teaching Aids: Best for teacher to use in lessons, this dice can be used for children to practise word and number spelling games. Let kids gains knowledge through play. Keywords: erasable dice, classroom teaching aid. Specifications:Material: EVAColor: Yellow/Red/Green/Blue Package Weight: approx.100g Size: approx.10x10cm/3.93x3.93in Note:Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks Package includes:1Pc DIY Blank Dice