This is a (currently wholesale only) inflatable unicorn horn for cats from Archie McPhee. It makes your cat look like a unicorn. No, no it doesn't. It makes them look like an angry cat with a wavy peen on its head. Still, they'll love wearing it. At least for the five seconds until they paw it off and pop it. And those five seconds they actually hated it.
Thanks to Dr. Professor, half doctor, half professor, probably 100% neither.