These have built-in vacuum ejectors, so you only supply compressed air to the Vgrip.
They can also be supplied with vacuum port for external vacuum pump.
The grippers foam pad compensates well for inconsistencies where a suction cup requires flat or flat surfaces. For larger and heavier objects, the lifting surface of a Vgrip will provide a steadier lift as you get a fixed square lifting area.
In cases where foam is not best suited on the surface, Vgrip can also be equipped with suction cups.
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See demonstration of different products and surfaces