Slickline is a single strand wire (unbraided wire). This is used for running tools in the wells. Mostly used is stainless steel and breakes at approximently 3000lbs
The benefits of using Slickline are many, when possible to use.
No Grease head, only a stuffing box and the micro-BOP.
Possible to run at much higher speeds, when the toolstring allow for it.
Less rig Up/Down time.