Features:

 2 per package
Size: 65mm Suction Cup
Heavy duty webbing long: 60mm

Versatile Usage - perfect for tie down applications where there isn't an anchor point, cleat or other device to anchor conventional tie downs.
For smooth fiberglass surfaces. - These do stick and hold wonderfully on a smooth surface (like a car or glass), however, any plastic surface suction cup will not stick if there is any texture to the surface whatsoever. It's the nature of the beast. If air can get in, the suction will not hold because it relies on creating a vacuum.