PureAClean blue, non-marking, NON ESD SAFE 1/4'' (6.35 mm) diameter vacuum cup.  The vacuum cup material is PureAClean, a catalytically cured silicone based rubber compound.  This cup material is ideally suited for handling residue sensitive items such as lenses or optical filters. 

Operating temperature limits (-65oF - 480oF) (-55oC - 250oC).

Electrical properties: Greater than 1013 Ohms.

Lifting capacity at 6 In Hg:   60 g (2 oz)

Lifting force is directly proportional to the vacuum level and the surface area of the vacuum cup being used .