4-Cup Rubber Chinese Cupping Therapy Set This rubber cupping set does not require pumps or fire. The largest cup size has a opening of 2.5" to treat large areas while the smallest cup has a 1" opening to treat the tighter spots. Made of durable thick rubber, 4 cup sizes, Safe, Included are a total of 4 cups. 6.3-7.2cm, 5.2-6.0cm, 4.0-4.5cm,2.5-3.0cm