2. Clearly see the mark of playing cards with perspective sunglasses
3. Perspective principle: white light
4. Good gift to friends for fun
5. Also can be used as normal playing cards and magic tool
These sunglasses look completely normal, they are capable of helping you read the invisible marked playing cards on the backs of the cards. All you have to do is wear them. They are light, with a simple design, suitable for men and women.