I bought these Satyr Horns from a Xena Prop House member who got them directly from KNB FX, the company that did most of the creature effects for both Hercules and Xena. These horns are made of rigid foam over a metal wire armature.
Horns like these first appeared in the Hercules episode “The Green-Eyed Monster.” In the screencapture below you can see two satyrs behind Karl Urban as Cupid. The horns may also have been used for subsequent appearances of satyrs.
They were also used in the Hell scenes for XWP “Fallen Angel“. The images below came from KNB with the horns and demonstrate their use for a demon.