CoverON for Microsoft Lumia 640 Hard Design Case [Slender Fit Series] Slim Polycarbonate Back Phone Cover - (Pink Butterfly) CoverON [Slender Fit Series] for the Microsoft Lumia 640 hard phone case with printed design Made of rigid polycarbonate plastic; durable and protective Unique trend-setting design to personalize the look of your Microsoft Lumia 640 Slim 1-Piece back cover for full phone protection 90 day manufacturer warranty