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This Item has 1 stick side and 1 normal side which you secure the suction cup to by double sided it means 1 side sticks to the plate and the other side sticks to the dash of your car

3M Double-sided Sticky Pad
This Sticky Pad is ideal for most of the Phone/GPS Car Holder, 
If you want to put the holder on your car Dashboard, you can choose this. 
The sucker of the holder can suck on the smooth side of this pad.

Warm Remind: 

After you stick this pad on your car dashboard, 

please leave it for 24hrs before you use it.

Diameter of the smooth side：

1.around 8.0cm 

2.around 9.5cm

PACKAGE INCLUDE: 1 pc of 3M Double-side Sticky Pad