Black-out! These helium quality Black Latex Balloons inflate to 12 inches high. Fill them with helium for up to 10 hours of flying time indoors. Fill them with air, and the heavy latex material ensures they’ll remain inflated for days on end. Seal the balloons by knotting the neck, tying them off with ribbon or string, or using one of our plastic balloon clips. Package contains 100 Black Latex Balloons. Note: Balloons arrives uninflated. To inflate it with helium please visit your closest Wanna Party store or contact any helium gas provider near you. Filling charges are extra.