The Suck N' Stroke Head Pump is a blowjob simulator and provides a powerful suction action that stimulates the nerve endings of the glans. Choose a ring first, slide it over the sleeve, fold the sleeve over the inflating cylinder, and enjoy a tight seal over your glans. Each time you press the inflating ball, the sleeve's rubber grips your penis and glides up and down over it. Use a generous amount of Moist® lubricant for extra lubrication. The kit includes: Medical style PVC ball pump. Super narrow sleeve. ABS cylinder 3 silicone rings Mask Lotions Toy cleanerDimensions: Sleeve: 124.65mm x 58.53mm x 2.77mm Cylinder: 81.79mm x 52.7mm x 2.09mm Tube: 44.4mm x 5.87mm x 1.64mm Ring diameters: 30 mm x 40 mm x 50 mmIncludes gift mask