The Gua Sha & Tools that do not meet the exacting standards we set for our premium A-Grade Treatment Products are what we call our B-Grade. These products have very minor flaws such as a small scratch, slight surface irregularity, a discrepancy in size such as being a little too thick or thin, or a discolouration. These products are perfectly suitable for use in self-care but are not suitable for use in Therapy Treatments.