Trident Perseus Case for HTC EVO 3D - Retail Packaging - Purple The durable silicone case protects the device from casual drops and also acts as an anti-skid pad. Features raised ridges on both sides of the case for a secure grip. The screen protector prevents scratches, keeping the device in great condition. The Perseus silicone cover is designed to be upgradable to a rugged Kraken series, providing the option to use the device EVO 3D