These bamboo cups are a more traditional and natural approach to cupping. The bamboo cups are light, cooler, and finished smoothed for comfort and safety. Some therapists will even boil bamboo cups in herbal or aromatic leaves to infuse them with the plant's aromatic properties. Size Chart  Size Inner Diameter (cm) Outer Diameter (cm) Small 3.00 3.80 Medium 4.00 5.00 Large 4.50 5.50