About this glass suction cups

Specification:
Handle Cup Type: Flat Cup
Diameter of Cups: 4-2/3inch
Maximum Lifting Weight: 200lbs
Material:
Handle body: Aluminum alloy
Suction pads: Natural rubber
Instructions:
Step 1：Before use，wipe the surface of the object cleanly, press the suction cup firmly onto the surface of the object, and then press down the handle to suck the object and move it.
Step 2：After the removal is completed, move the handle to its original position and the pad can be restored.
Usage:
This suction cup can be used on smooth surface, such as:
Glass mirror
Ceramic tiles
Marble
Wooden floor

What in the box?
User Manual*1;
Glass Suction Cups*2.