Rubbing a white sponge and a red sponge in your hands creates a large die. https://youtu.be/PH6VXR3srRw?feature=shared Easy to do. The die is about 10cm. I bought this, but realized I already had another one, so I'm selling it. Used only once to confirm it works. A set of red sponge balls and a die for magic tricks. - Type: Sponge die and sponge ball - Description: A set of sponge balls and a die for magic tricks - Size: The die is about 10cm - Color: Red - Use: For magic tricks Thank you for looking. #MagicTrick #Magic #SpongeBall