EC1-C features reduced weight and paracord cable for more flexibility in movements. The updated EC series uses the 3360 sensor as well as the two large mouse feet design. For typical palm grip users, the top shell provides a natural curve for your hand with a relaxed support to your palm and fingers. In a typical claw grip, the mouse is held by curling your fingers together with support from your lower palm; the shape's curved back provides an even contact to the lower palm for better grip. It also keeps your movement flexible from the front end of your palm to your fingers. The right side of the mouse is raised at the front to provide more space for your 4th and little finger. Together with the curved shape of the back, EC provides flexibility for the 2nd and 3rd fingers to click the buttons more easily. The concave curve on the right side helps your 4th and little finger hold the mouse tightly and effortlessly. The side buttons are intentionally positioned to avoid accidental clicks and lets your thumb rest. With the EC's smooth and seamless design, you won't experience any discomfort related to jagged edges or protrusions made solely for aesthetics.