iPearl mCover HARD Shell CASE for 15. " Dell Inspiron 15 (3521) and 15R (5521) Laptop - Aqua Designed to protect ALL corners for Dell Inspiron 15 3521 and 15R 5521 series laptop. Made of USA-made high-quality translucent DOW polycarbonate material, which is shatter-proof and will protect your 15.6&quot;(diagonal) Dell Inspiron 15 3521 and 15R 5521 series laptop all around. 2-piece light-weight (12 oz or 330 g) shell easily snaps on and off. Designed with Retractable feet at the rear bottom to let you type more comfortably. It also helps to prolong your laptop&#39;s life with BETTER heat ventilation from features like retractable feet and more wider ventilation slots. Designed to fit the 15.6-inch (diagonal) Dell Inspiron 15 3521 and 15R 5521 series laptop perfectly.