"Wing tips" refers to the outermost ends or edges of an airplane's wings. They are designed to improve the aircraft's aerodynamics and reduce drag. Full definition
I also have to use the largest set of wing tips that come in the box, and after an hour or two of listening my left ear aches a bit from using them. (theverge.com)
You get three differently sized ear / wing tips so you can choose between them for the best fit. (soundguys.com)