Tienen una estructura sólida y compacta, (sin holguras ni crujidos raros) a la par que flexible por la parte de la diadema, ya que la podemos deformar sin que llegue a partirse. I also just recently purchased the The right earbud you can hardly hear out of it and the left earbud wont charge anymore. They are easy to install and came with plenty of screws. smelled like a factory exhaust system and was in a plastic bag?! I tried charging the headphones from three different things (Computer and two different chargers), using four different cables, including the one it comes with. This has everything you could possibly need to start making bracelets great variety of beads great variety of colored material and scissors it comes with so much These are pretty light and fit over the ears nicely I have fairly large ears but these are quite comfortable they do need to be broken in though as they clamp pretty tight right out of the box. I replaced the silicone ear piece with the larger size and pressed them more firmly into the ear and I found they then sounded fuller, (but not bassy). I drilled a very small hole through the pad and strap at the edge of the pad perimeter binding.