Dark blue, richly colored nylon plastic with a smooth finish.
About this Product
With this little game you can test the intelligence of your friends, family, bar mates and colleagues. let them only see the card and ask if they think there exist a form that will fit in all three holes (not at the same time) and must touch all the outer edges. Let them think for a while and than show them the form and prove that it exists. Lots of fun. The card has the size of a credit card.