Top down view gives us an indication of the sculpted ergonomic shape, including grooves for your ring and pinky finger as well as being shaped to accommodate your thumb.


The front of the Castor shows a low set mouse wheel with a DPI button sitting behind it.


The forward/back buttons are a nice size and sit above a textured rubber grip.


The rear view gives a nice perspective of the ergonomic shape, as well as a view of the Mionix logo that will be back lit by an RGB LED.


As the Castor is ergonomically shaped, it is solely for right handers and is not ambidextrous. As far as we know there is no mention of of a left-handed version, though considering Mionix are no stranger to crowd-funded projects and still consider themselves a start-up, with enough demand maybe it could happen with later lines.


Two large PTFE slip pads for the front and back while the sensor sits inside the Mionix logo positioned approximately at the centre point.