Set with 9 catenary rosettes.
An overhead line rosette - also known as a house rosette, wall rosette, wall anchor, wall iron, overhead line hook or in Austria wall rosette - is a special form of contact wire suspension on trams and trolleybuses, and more rarely on railways. The rosettes, mostly made of cast iron, are used to anchor or brace the overhead line on the buildings of the streets through which they pass. They are always used when due to spatial (for example narrow streets) or aesthetic reasons no overhead line masts can be erected. Costs also play a role: Rosettes are significantly cheaper to build than masts. (Q: Wikipedia)
The highly detailed, unpainted model was produced using the 3D printing process and can be processed and painted with commercially available tools and colors (e.g. with Revell Email or Revell Aqua Color).