Check the listing for details. Ritchey Switch Headset Stack Spacers - Switch System Compatibility Only, 5mm, 5. Color: Black, Condition: New. Listed at 11.95 USD. Unique to the Ritchey Switch System, these interlocking headset spacers facilitate the routing of cables and wires from the Ritchey Switch Stem into the Switch Headset. Mirroring the shape of the underside of the Switch Stem, these special spacers are key to the clean look and integrated functionality of the Switch System, and they can be installed or removed without disconnecting any cables.The Ritchey Switch System is an innovative integrated system designed to easily conceal internally routed cables, wires, and hydraulic lines from the handlebar into bicycle frames with straight 1.5" head tubes together with tapered 1-1/8" – 1.5" forks. The Switch System consists of three elements: Switch Headset, Headset Spacers and Adapters (Sold Separately). Made from Nylon and glass fiber. 5mm.