Standard: The soft tube cup gives you complete control over the tightening sensation that suits you. Control how tightly or how lightly you grip the masturbation cup. Enjoy a wide variety of sensual sensations from rubbing, stroking, pressing, etc. One remarkable feature is the ability to “squeeze out" of the cup after ejaculation. Soft: The Soft cup has a softer, gentler grip for a more relaxing experience. Hard: The Hard cup provides a deep and intense suction combined with a hard tightening action. Ultra Size: The "ultrasize" and "super vacuum" (U.S.) edition cups are 20% larger and are designed for the more endowed.