When selecting fire cupping sets, the material is the most critical factor for safety and durability. Thickened borosilicate glass is the industry standard because it is heat-resistant, transparent for skin observation, and easy to disinfect. For professional clinical use, ensure the glass is lead-free and has a smooth, rounded rim to prevent skin abrasions. While traditional bamboo cups are available, they are harder to sterilize and may crack over time; therefore, glass is recommended for international B2B buyers due to its compliance with modern hygiene standards.