Three principles: 

1. Atmospheric pressure theory

2. Static theory 

3. Viscous theory

Five characteristics:

1. Eco-friendly, it can reuse, and no mark left

2. Practical, easy to use, super strong loading capacity.

3. Beautiful, delicate designs can be printed.

4. Waterproof, when it sticks on surface closely, it will not fall off even meet water.

5. Durable, normal use for more than two years.

Eight advantages:

1. No nail.

2. No drilling.

3. Washable.

4. Easy to take down and stick on.

5. Can be advertising gift.

6. Save money.

7. The hook can be used in smooth surfaces (such as ceramic tile, glass, paint woods, 

stainless steel plate etc.)

8. Easy to operate, everybody can use it.