Original HTC Thunderbolt Crystal Silicone Case, 70H00372-04M - Black Most silicone cases are extremely light weight and rubbery; this is where the case differs. A merge between highly durable plastic materials that you find in many electronics packaging, silicone for it's flexibility and is somewhat crystal clear with a nice sheen. Together these elements give your phone, the best possible protection and grip without having you to sacrifice style. Original HTC Thunderbolt Crystal Silicone Case, 70H00372-04M - Black Original HTC Thunderbolt accessory Reinforced silicone case - more durable than standard cases Extra grip and traction to surfaces Flexible nature - conforms to your phone case, but does not stretch Phone features are fully accessible Color:Black Brand: Part #: 70H00372-04M Original HTC Thunderbolt Crystal Silicone Case, 70H00372-04M - Black