Nothing to drill. Maybe it was just a messed up album on my music sight. Definitely recommend if you want a great product that will last you a long time. My biggest thing was, I bought these for poolside. They sound muffled and nowhere near as clear the OEM AKGs. Wasted so much money on stuff that just doesnt last, because its made out of synthetic materials. The rubber exterior is lined with wires so you can bend them for a perfect and secure custom fit. Update: had a chance to take it out for a spin over the weekend. People that find relief when using insoles or orthotics in their shoes will find themselves right at home with sandals like these. This blue dress isn?t see through.