Exfoliants may come in many forms, however their purpose is the same - to slough off the dead skin cells on our bodies. When we are young, our bodies are generally effective at doing this with little help (eg towel drying ourselves after a bath or shower), however with age we start to slow down and need a bit of assistance.
Exfoliants typically come in 2 forms - for face or body. You can use the face ones on the body, however you should never use the body ones on the face or you will damage the sensitive skin. Bad enough if you are doing it to yourself, however not good if you are manufacturing for clients.
Jojoba Ester Beads are my preferred choice, although I also have ground walnut shells. If your products are nut free, do not use the walnut shells!