Ideal for Bondage games. Starting as nipple twist suction cups. The Kiotos nipple Cups can be applied on any body part you like. With a twisting motion. the cup turns into a suction device. The more you turn. the harder it sucks. - The Cups are available in 5 sizes: Small 20 mm. Medium 30 mm. Large 40 mm. XL 50 mm and XXL 60 mm - Colour Transparent & Beige - Size - SMALL -Inner Diameter:20 mm