- The twist-top type of suction cup is the only type to allow you to control the degree of suction once the cup is already installed on the skin
- This small, durable set is easy to carry and to manipulate.
- Place cups directly onto the skin and turn the twist top clockwise to create suction.
No.3 Inner Diameter: 1.58"/4cm
No.4 Inner Diameter: 1.9"/5cm
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