Self-adhesive bars are made of the special polyester silicone gum water and sponge cups. This is nontoxicity,smellless and innocuously. With the characteristics of supper light close fitting and soft. Adheres to breast easily.without straps and back cords. You will feeling nothing bondage after wearing. It is well-ventilated, comfortable, wearable washable and durable. The is safe and not subject to distortion.