The mouse is 117mm long, so is on the smaller side of mid-sized mice, and has an ambidextrous shape. There is subtle ergonomic shaping such as finger grooves and a slightly narrower centre portion.
The mouse wheel has a rubber coated grip on top and acts as one of the two RGB lighting zones, behind which there is a single DPI toggle button.
The forward and back buttons follow the shape of the mouse and are a nice size, not too small, but not overbearingly large. The mouse hump is slightly more towards the rear, though as it is a little smaller than other mid-size mice, it should suit most grip types.
At the back, the MasterMouse shows its Cooler Master logo, but that isn't the second RGB lighting zone, its actually the narrow band at the base, similar to the MasterMouse PRO L. This is an attractive and more interesting style of lighting compared to others that light up the logo that will always be hidden by the hand.
Though the MasterMouse is ambidextrous, it only features a set of forward/back buttons on its left side.
Here we find that the sensor is positioned slightly more towards the rear, while the PTFE slip pads are symmetrically placed.