iPearl mCover Hard shell case for 11.6-inch Acer C720 (Purple) Designed to perfectly fit the 11.6-Inch acer Chromebook 11 cb3-131 laptop and protect all corners. Designed with retractable feet at the rear bottom to let you type more comfortably. Designed to perfectly fit the 11.6-Inch acer Chromebook 11 cb3-111 laptop and protect all corners.