Your choice depends on the desired look and the weight of your painting or wall decoration. There are 2 main types of picture rail hooks to choose from: STAS smartspring and the STAS zipper
STAS zipper pro is equipped with an extra theft-delaying bracket. As a result, paintings and other artworks cannot be taken off the wall in one move. Ideal for use in public or busy spaces.
STAS smartspring on perlon cord – carries loads up to 4 kg (8.8 lbs)
STAS zipper (pro) on perlon cord - carries loads up to 15 kg (33 lbs)
STAS zipper (pro) on regular steel cable - carries loads up to 20 kg (44 lbs)