Fidue A63 noise isloation in-ear earphones are built using 8mm super dynamic titanum composite drivers. The earphones are housed in a beautifully machined metal casing, making them durable and perfect for heavy use but without adding too much weight. The Hi-Fi quality sound provided by the A63s is not only clean but also clear and balanced. So buy this FIDUE A63 In-Ear Noise Isolating Earphones with Dynamic Driver - £49.00.