Internal Bag separates the urine from the pressurizing agent so there is no contamination. System allows the entire product to be dispensed. Sprays longer than traditional spray cans. Tink's #69 Doe-In-Rut Buck Lure is 100% natural doe estrous urine collected from live whitetail does during their estrous cycle. Tink's #69 Doe-In-Rut Buck Lure America's #1 Buck Lure!