Bastex Heavy Duty Hybrid Case for Apple Iphone 4, 4s, 4g, 4gs - Black Silicone & Kickstand Hard Shell Cover We can provide custom phone cases with any design for you. If you want, please contact us! Use rechargeable lithium polymer battery. Snap-on design. No tool is required for installation. Form-fitting durable protection Shock absorbable and anti-bump for ultra protection.