These are tools I designed to help correct my feet. Both my big toes when gripping something had the big toe sliding under the second or long toe. Plus, with arthritis in the big toe joint from injuries I was unable to put any pressure on my Big toe pad. This created walking and balance issues plus a generally weak foot. My feet were my weakest link. Using these tools five to ten minutes a day I could restore my feet. No longer did my feet hurt from staying on them to long. I can grip things and not have my Big toe slide under. I can put all kinds of pressure on my toe pads where before I could not. Using these devices and the miscellaneous exercises work to promote healthy feet.