Crystal Cock with Balls Vibrator Purple. Crystal clear, semi-soft vibrating veined 7.5 inches vibrator with fat head and vibration throughout entire shaft. Thermoplastic Rubber TPR is a class of polymers, the characteristics of which mimic many of those of Silicone hygienic, soft, pliable, durable, non-porous. Safe and pure phthalate free as well as recyclable. A water based lubricant is recommended. Jelly vibrator requires AA batteries, not included. Do not leave batteries in the vibrator between uses. A water based personal lubricant is recommended. Always clean before and after use.