This is the 10' long elastic shock cord (or bungee cord) that recoils the chain on recovery.
Concept2 Shock Cord — Model A, B Indoor Rowing Machines
Concept2 Indoor Rower GENUINE New Bungee / Shock Cord for Model C, D, E machines
Concept2 Indoor Rower GENUINE Bungee / Shock Cord for Model C, D, E machines
Rowing Machine Elastic Rope Bungee Shock Cord for Training Fitness Equipment
