OSIM uGlow Guasha is crafted using Bian stone (砭石) — a natural material rich in minerals and trace elements. Due to its natural composition, each stone may feature slight surface irregularities such as small pores, fine marks or lines, and white marks or specks. These are inherent characteristics of Bian stone or may result from post-processing. They do not affect the product’s performance, safety, or effectiveness. Each piece is unique, and these variations are a testament to its natural authenticity. Product Usage Suitability This product is not intended for self-diagnosis or self-treatment of conditions that should be managed by a qualified health care provider. If you are under any medication or fall into any of the following categories (but not limited to), please consult your health care provider first before purchase / use: a) Heart diseases, b) High, or low blood pressure, deep vein thrombosis (DVT), c) Pregnant, d) Diabetes, e) Individuals fitted with medical implants (e.g pacemaker, automatic cardiac defibrillator (AICD), f) Recently underwent surgical operations, g) Those with any bone conditions like fractures, osteoporosis.