A pair of stainless inner cables long enough for boxbikes and longtails..

to replace you need a pick or bradawl to ease the old cable end from the shifter before you fit the new inners….lots of patience, and ideally the cable end fitting tool for the hub end fittings or, because its a tad confusing for the average human to set the hub end fittings up….you might need another set of inner cables and a stress ball...