What was first the Gonzo Hand trainer has evolved to the Mighty Hand Trainer. A palm/thumb shape metal "hand" that has a tail with 4 attachment points on it. The tail can also be locked in place by tightening the split collar or using it loose where the MHT swivels. This is the Big Fat Red version, a larger size than the standard Mean Green one. It is thick, if you have smaller hands, it will open up your hand and fingers will be wishing they were longer, if you have a large hand, this is the one for you.