They are Koso Stinger LED indicators purchased from.
http://www.digital-speedos.co.uk/. I spent a long time in choosing them, some LED blinkers look good but aren't bright enough (for me anyway). The originals are a bit big but lets face it they let others see your intention. I have to say these are really bright! I'm super impressed with them. I bit costly but not ridiculous given their purpose.