The Sabre v2 Pro Wireless MG is a sturdy, ultra-lightweight mouse with a magnesium alloy shell, but it doesn't feel worth the premium price tag. Lightweight 120-hour battery life Bluetooth Big holes Expensive Why you can trust Tom's Hardware Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test. Instead of reinventing the (scroll) wheel (or something), Corsair decided to take its ultra-lightweight high-performance Sabre v2 Pro wireless mouse to the next level — material-wise, that is. The brand announced two new versions of the Sabre v2 Pro at CES in January: One made of magnesium and one made of carbon fiber. This might not sound like a significant difference, but there are so many ultra-lightweight, stripped-down performance-first gaming mice these days that they're all pretty similar. So we took a look at both, naturally.…