The material makeup of a rose vibrator will determine its level of firmness and rigidity. It's typically made from silicone or latex and has a soft, pliable feel, but can be firm and rigid. The most common material used to make rose vibrators is silicone, which can be soft and pliable like jelly or firm and rigid like a hard plastic. Silicone is also hypoallergenic, so it shouldn't irritate your skin if you're sensitive to other materials.Silicone's ability to be both firm and flexible makes it the ideal choice for this type of clitoris stimulators because it allows the user to use their own body weight as leverage during use, rather than relying on a rigid object that may be difficult to hold onto or cause discomfort when used in certain positions.