I had no luck finding a pic of a Sharpfinger, but if it has only one cutting edge and is less than 5.5 inches in blade length it should be OK. Except for the ironic banning of Bowies, Texas has quite reasonable knife laws. Another nice thing, to my mind, is that concealed/open carry is not an issue, either. The law does not specifically name double-edged knives as illegal, but "case law" has decided that double edge=dagger or dirk. Balisong/butterfly knives are not specifically named as illegal, but they fall under the definition of opening with centrifugal force or gravity, which are also illegal. Also, fixed or folder makes no difference in Texas law; both are OK, so long as the blade is otherwise legal. Like anywhere else, there will be police officers who don't know the law as well as they should, so the more innocent your knife appears, the better, and don't "act a fool" with a knife. It certainly would not hurt to carry a photocopy of the relevant section of the Penal Code with you if your carry knife looks menacing or pushes the limits.