Thomson elite covert dropper seatpostthe covert dropper post is built for bikes that utilize internal housing and cable routing for dropper posts housing and cable exits the bottom of the post and does not move when the post moves covert droppers cannot be converted to external cable models and existing external cable droppers cannot be converted to covert you want the increased control a dropper post gives you but you had to give up your thomson post to have it not any longer you can put yo