LoonBalloon BREAST Cancer Awareness PINK Bow RIBBON Heart 3 Mylar Foil Balloons Kit SET. Accent your Breast Cancer Awareness themed party with this 17in. heart shaped Promise, Hope, Cure foil mylar balloon. The perfect balloon for your Breast Cancer Awareness party, this 17in. party balloon is great for setting the scene! This balloon includes a self-sealing valve, preventing the gas from escaping after it’s inflated. The balloon can be inflated with helium to float or with a balloon air inflator. Balloon arrives uninflated. 17in. Promise, Hope, Cure Foil Mylar Balloon.