The Stud Lasso 10 Function Vibrating Silicone Erection Enhancer from Cal Exotics. The best selling Lasso is now silicone with 10 functions. This comfortable adjustable erection enhancer provides extra support and stamina for him. The removable bullet provides 10 intense functions of vibration, pulsation, and escalation for a partner while the nubby silicone sleeve provides added stimulation. Made out of silicone (lasso, stimulator sleeve) ABS (stimulator). Batteries included (3 watch, 6 included). 5″ (adjustable lasso). 2.25″ x 0.75″ (bullet).