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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@lpg
also, they all emit different colours(thanks, wikipedia), perhaps you could incorporate somehow..
Neon 
Argon 
Krypton (but maybe greener) 
Xenon 
Helium
or send these out as a free gift, good for being spotted so you don't get run over
