$1​
below is wordy description of how they look in case you care:
visually they are like two circular plastic pieces that are side by side, creating a vague figure of eight shape. one of those circular shapes is more like a sphere. the other is more flat but has some thickness still. in the middle of that flatter one is a hole with a metalic trim around it. i think that metalic trim is actually shaped into a dome, with a hole in the middle, because it can sit in your ear and let normal ambient sound pass through that hole into your ear but also sounds from the earbud is generated inside and projected out through to the metalic trim and bounced into the ear. the side with the metal is what sits in the ear canal area and the spherical section rests against the the ear. i think it resembles sports earbuds where they get a little bit of clamping force by pushing against the shape of the ear by the concha.