EMPIRE Sony Xperia Tipo ST21i Poly Skin Case Cover (Black S-Shape) [EMPIRE Packaging] Compatible with Sony Xperia Tipo ST21i. Case is made of form fitting polyurethane material which ensures perfect fit without adding any bulk. Engineered to fit device perfectly, with cut outs to allow for full device functionality. Provides added grip which ensures extra protection. EMPIRE is a registered trademark with the USPTO.