Ikea Plastic suction hooks (New But Discoloured) (Handforth SK9)

There are two suction hooks from Ikea for using on surfaces like tiles but not plaster or wallpaper. They have a strong suction as you lock it in place. They have been opened but have not been used, they were also stored on a shelf in the sun and have turned yellow in places. There does not appear to be any instructions so I may have lost those but they should be easy to work out. Collection from Handforth.