The race for the ultralight-weight mouse is on, and all seem to adopt the honeycomb cutout design too. After Glorious PC Gaming Race impressed us heavily with their Model O mouse that came in ~67-68 grams, we saw Cooler Master's MM710 shown off at Computex this year rated at under 53 grams! While neither company was the first to use this design, the MM710 is still another 1.5 months away from retail release and the the former saw a window to release their new Model O- mouse at Quakecon last week.

The Model O- ("Minus") is a smaller version of the Model O, and otherwise will come in all four variants of color and finish options the Model O does. It is rated at 58 grams (matte finish, 59 for the glossy finish) without the cable, 1.5-3 mm smaller in all dimensions relative to the Model O, features the same internal guts with the excellent Pixart PMW3360 optical sensor, and is now up for pre-order at the same $49.99 on their website. If you felt you wanted a smaller mouse that was even lighter, there is now another option for you to choose from. Let us know in the comments what your thoughts are on having a more exposed mouse chassis in the quest of mass reduction as well.