VS-1 Therma Pads are scented with the popular VS-1 scent. VS-1 is made of 100% doe estrus urine and vaginal secretions collected using Synchronized Cycle Technology. This gives VS-1 the highest concentration of pheromones possible. Product Features Easily hang from tree limbs and branches Compatible for use in heated butane scent dispensing devices. Biodegradable, scented pads that are safe for wildlife and the environment. Resealable and reusable ziploc storage bag helps keep scent fresh.