We designed the Bullseye Wrist Band to treat TFCC tears, distal radioulnar joint or DRUJ instability, and repetitive strain injuries. The Bullseye Wrist Band was not designed to treat Flexor Carpi Ulnaris Tendonitis (FCU), extensor carpi ulnaris (ECU), De Quervain's tenosynovitis, Ganglion cysts, or carpal tunnel syndrome. While some customers have had success using it for the aforementioned contra-indications, it is best to consult your medical professional for alternative treatments.