SRAM's Shift Cable Kit is the right kit to have on hand so you can fix a broken cable and a nice upgrade, too. It comes with 2 1.1mm-diameter SRAM shift cables and enough SRAM 4mm-diameter compression-free housing to fit any size bicycle. The housing has a slippery liner for super-smooth shifting. You also get SRAM aluminum ferrules and cable crimps to prevent fraying.

Original equipment hydraulic hoses for no-compromise brake performance. - 2000mm, black

SRAM's Professional Shift Cable System by Gore Ride-On is a nice upgrade shift-cable kit. It boasts 2 cables coated by Gore to be super smooth and their compression-free 5mm-diameter housing. You get ferrules and cable crimps, plus Gore's Grub Seal and MTB Grub Seal, too.