They are unique and different and named improperly. Lembrando que através do aplicativo é possível equalizar o som, ajustar a intensidade dos graves, então mesmo quem não goste dos graves vai apreciar a qualidade sonora deste fone. I cant believe Amazon is allowing these to be sold on their site. I needed new earmuff to go on my headphones, and these fit perfect. Tried to return, but Amazon kindly gave me a one day return window while on the business trip - complete waste of money. Beats(Powerbeats) Ill never think toward buying. Another GSI great product! I ordered this as a back up but I’m so glad I bought it when I did. Was able to assemble it in an hour or so while watching television. At this price, its not a problem to replace them every once in a while.