The 9.9 Gym Workhorse Classic is a hard-wearing single rope for all-round use, it is the most durable rope Mammut make. Designed for redpointing and working routes indoors that's not to say it can't be used outside aswell, this rope can handle everything you throw at it. Despite the incredible durability, it is packed into 9.9mm diameter with a minimal weight.
It is part of Mammut's overhauled rope range and is BLUESIGN certified demonstrating its strong eco-credentials.
This classic version is untreated for great value. If you want it to stand up to abuse better consider the DRY version which has the core and sheath treated to massively improve durability and prevent water ingress. If you're looking for a similar rope in longer lengths check out the 9.9 Crag Workhorse Dry.