Type: AL-15

Includes gold-plated phono plugs provide excellent corrosion resistance. 
Since RCA-type phono plugs are normally inserted and removed many times, they   must be highly resistant to abrasion and provide superior conductivity even   after extended use. Another important consideration is the ability to withstand   corrosion which can be caused by sulfuric gases and other contamination in the   atmosphere.
The thick gold plating of the plugs perfectly fulfills all of   these requirements.