The user can adjust the weight of the mouse to his taste or even shift the center of gravity by placing the lead weights accordingly Durable smooth feet and contoured body Quality ABS construction and two programmable side buttons Fast and accurate feedback is ensured thanks to high quality micro buttons Surface coating with blended in fine-dispersed sand provides firmer grip of the mouse, anti-skid scroll wheel and red backlighting. balanced feet height and optimal place the mouse moves strictly horizontally