These sanding paddles will last for a very long time but they are reusable only on the same patient since they are not sanitizable.
They are very easy to use because of the plastic paddle style. They are easy for you and for the patient.
Both sides have sanding surfaces. One side is fine and one side is coarse.
These might be good for use in your practice or you might consider selling them to your patient for them to use at home between visits to you. It can be a great service to your patient to show them how much you care about their long term health.