The Colt Nipple Pro-Suckers include 2 fully adjustable multi-use suckers with a unique vacuum pressure design. Simply twist to adjust the intensity of the suction and increase the sensitivity of your nipples. The secure seal stays in place. Disassembles for easy cleaning. Materiial: AS (cylinder) ABS (cap, plunger) Silicone (seal) 4 inch x 1.5 inch/10.25 cm x 3.75 cm.