Looks like it's made of snake skin.
http://www.parleecycles.com/picture/z1_twinstays.jpg?pictureId=3680339
@LongAndWinding 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.
Looks like it's made of snake skin.