Otter Box Prefix Case for Huawei P20 Streamlined Otter Box case for Huawei P20 delivers effortless and reliable protection. Prefix Series passes extensive testing protocols so you know your phone is safe from daily tumbles, drops and scrapes. Its slim, one-piece design incorporates internal coring that absorbs shock and external features make for great grip and easy access to phone features. Features Drop Protection Ultra-Slim, One-Piece Design Shock-Absorbing Inner Core For: Huawei P20