HTC Thunderbolt / Thunderbolt 4G LTE moreTalkTime TPU Case for ASIAN/INTL/GENERIC (NOT OEM) Extended Battery (Double matte, black) Custom Case to fit over your extended battery. Allows for full use of all ports and buttons (cut outs). Case wraps around edges to front of phone to protect screen from scratches if it is laid down. Not a jelly or sticky material like silicone. Does not hold lint. More durable and rigid (yet still flexible) than Silicone. Virtually scratchproof and water resistant.