Inclusion Criteria:  Must have an upper limb partial hand absence. Must be new or current i-Digits prosthesis users. Must have an absent index finger at minimum. Must be able to understand spoken and written English in order to be properly consented and provide feedback to the study personnel. Must be willing and able to complete outlined tasks and provide feedback on the intervention.  Exclusion Criteria:  The risks to pregnant women and fetuses are unknown and therefore pregnant women should not participate in the study.