This is supplied in kit form as pictured so you can cut to length (or use your own outer).

• Shimano SL-3S41E rotary gripshift shifter to work with the nexus inter-3 hubs 
• Display scale shows the current gear at a glance
• Handle can be turned in one go to the desired gear
• Enables the use of roller, cantilever brakes or v-brakes with power modulator anti-lock protection with the brake lever.
• Smooth-running mechanism is operated without re-gripping
• Supplied with 2.2m inner wire 
• Shimano outer gear casing 1440mm