I purchased them because I have concrete floors. Looking for something lighthearted and fun this is it. Align the top, sticky side up, with the one on the bottom and close the lid. Creo que la tabla que viene adjunta con las fotos está equivocada porque es en base a numeración de hombre. Beautiful well made. I?? Maybe its to early for a review. This one is so Easy to Assemble. A nice feature is that they have an online volume control so I can boost up that quiet and hard to understand client or vendor (another reason my wife likes them better than the $60 something headset her company sent her). It did nothing.