Introducing Monkey Flask: a pre-mixed synthetic urine designed to simulate human urine for all your fetish needs. Created and tested in a laboratory, this synthetic urine is so similar to the real thing, it’s even used by professionals and lab technicians to calibrate their urinalysis equipment! So, rest assured, no one will ever know it’s not your own urine you’re using. It even smells like urine and foams when you shake it up.