Trident Cases Kraken II Series for HTC Thunderbolt with Holster - Red Double-Enforced Corners All Kraken Series cases are designed to handle substantial drops and other impacts. Each corner of the Kraken for Thunderbolt features reinforced, shock absorbing silicone for extra protection. Moisture & Debris Insulation There are two important features integrated into the case to keep dust out: Audio and power jacks are both covered under the silicone skin with firm, removable plugs.