I bought these for the noise canceling to help drown out my neighbors drums. I bought many bracelets that are more expensive than this one but they are nowhere near this beautiful. I have no explanation why these batteries would be defective as Ive never experienced this in the past with Duracell. These seem to be exactly what I wanted. The detail is in the small print! Además estas son muy bonitas, se adaptan muy bien al pie y va bien recogido aunque sean solo dos tiras estrechas. The waist is slightly elasticated as well as being a little big on the waist size down if you ask me. Save your money and buy something cheaper. The ability to have them re-webbed and re-soled is an added feature with this company, as well as custom orders. these should be design to adjust a bit larger to accommodate handle-bar with at least normal handle tape/wrap.