I have purchased TWO pairs in the past SIX months and both developed a big toe hole after THREE months of use! I bought these for my daughter birthday and she love them great fit. The size and design are very cool. Drive unit: 1 Dynamic 10MM woofer + 4BA 6MM Tweeter5. It also looks more expensive! Worth the expense and I am purchasing the other colors :) we are very pleased this is, after all, a product review. That is incredibly disappointing! Edit update: I stand by my concern over these headphones.