The Sonic Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible. The main purpose of an aerobar is, of course, to get the rider into a fast position despite a fairly minimalist appearance the Sonic Ergo offers a comprehensive fit range for exactly this purpose. There are 100 distinct position options achievable just by moving the armrests. Combine that with the risers and this bar offers 1500 possible configurations.

Adjust the extension width and tilt easily
Clamp Diameter: 31.8mm (26.0 w/Shims)
Armrest: Ergo / 10mm Pads
Armrest Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm)
Armrest Offset: -70mm to -17.5mm in 7.5mm steps
Armrest Stack: The minimum is 60mm and the bracket is compatible with up to 130mm stack with (70mm of spacers added)
Weight: 545 g