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These suction cups can be attached to glass, and will hold easyblackout and Go Anywhere blackout materials (but not original blackout material).
They have a 'double' construction with one ‘cup’ inside another for added strength.
How do they work? Simple - each suction cup has a small disc at the back with a ‘hooked’ finish which will attach anywhere on the window side of easyblackout or Go Anywhere material, in a similar way to Velcro®.