These are jagwire sport adjusters
"Sport Inline Adjusters Two 50mm lengths of 4mm shift housing with end caps included; not recommended for use with brake systems"
Sorry, I understand the difference and potential safety issue.
@Cranky started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
These are jagwire sport adjusters
"Sport Inline Adjusters
Two 50mm lengths of 4mm shift housing with end caps included; not recommended for use with brake systems"