The Sandberg Destroyer FlexWeight Mouse allows you to decide how much your mouse should weigh. The speed of which you can move your mouse is essential to your performance, and this is where the weight of the mouse plays a crucial role. There are five small weights built in to the underside of the mouse, which you can easily replace as needed. The mouse has been designed with a good grip so that it is also comfortable for long gaming sessions. The colours of the LED lights can easily be changed by pressing a button on the mouse.