Shimano SW-9070 Dura-Ace Sprinter Shifters
Sprinter shifters for Dura-Ace 9070 Di2. These barely visible satellite shifters clamp onto the drops of your handlebars, and provide much easier shifting when riding in a paceline, or contesting an important sprint victory. To install these sprinters, wrap your handlebar tape over them, cut out the smallest of holes (less than a centimeter) and sprint.
While these were designed for ease of shifting during a sprint, 25-year Shimano test rider Wayne Stetina found them very useful riding in a regular paceline. When your hands are in the drops for long periods of time, it's much easier controlling your bike when you don't have to reach up, and stretch your hand to shift gears. Instead, give the slightest flick of your thumb and you're always in control.