Shimano 105 Flight Deck ST-5510 Shifter Brake Lever Road Bike 2x9 Speed Set | eBay
Shifters- Shimano 105 ST-5600 10X2/3 Flightdeck - Grade C
Whats Shimano Flight Deck all about? There is a ribbon cable inside and what seems to be a button by the thumb of the shifter. What is it for? : r/bikewrench