This wedge can be used on both hands. One size.
It is the size of the therapist’s fingers that determines the location of the “wedge”. A therapist with a small hand places the wedge right up by the palm of his hand, while a user with a large hand may only need to place it on his fingertip.
The TepperWedge is very good at manipulation along the spine, where it protects both the therapist and the patient.