This Temptasia pump is perfect for stimulating your nipples or your clitoris. The pump comes with 3 cups in different sizes so you can have plenty of variety. By squeezing the trigger you create a vacuum and you can thus adjust the suction exactly to what you find arousing. Once the cup is sucked in, you can loosen the tube and the cup will hold its vacuum. The pump has a pressure release function. Cup measurements: Large 7.6 cm long x 3.8 cm diameter Medium 7.1 cm long x 3.3 cm diameter Small 7.1 cm long x 3.3 cm diameter