Includes versatile wide gate spring hooks and attaches via heavy-duty webbing , These suction cups stick to fiberglass surfaces like glass, boats, SUPs, and campers Versatile Usage - perfect for tie down applications where there isn't an anchor point, cleat or other device to anchor conventional tie downs. Suitable for surface - These do stick and hold wonderfully on a 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 of the . If air can in, the suction will not hold because it relies on creating a vacuum. No Residues - No Glue -Strong Sticky gel base is added to the suction cup to stronger hold. The suction cup will in cold or hot environment. Long Lasting hold, will not come off remove it. strong grips on surface. Control: Non-automatic colour:Black Material:plastic Package Contents: 1 set x Sucker Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.