Single 13mm driver for the low-end, an 8mm for the mids and a micro-DD 6mm for the highs controlled via a 3-way passive crossover network, the bass adjustment is a nice touch, not a great difference but noticeable in the way it attenuates the bass. I left it open most of the time to get the best from that nice big fat 13mm low end driver.
Probably had around 100 hours use so drivers are burnt in, tips not used as I used final e buds on these. Nice leather dignis case, has a few slight marks as you can see in the picture, but other than that it's in top condition.