TechPowerUp checked out the Finalmouse UltralightX
Finalmouse UltralightX Review
Being made of a carbon fiber composite, the ambidextrous UltralightX is among the lightest wireless mice available at 38 g. The browser-based software for the ULX is just as lightweight. In addition, the ULX is equipped with PixArt's PAW3395 sensor, and delivers true 4000 Hz wireless polling.