DirectGlow Brand Set of 50 Assorted 11 inch UV Blacklight Reactive Latex Balloons (6 Color Mix) Neon colored in normal light. Designed to be incredibly bright under blacklight. 100% latex construction. Holds regular air or helium for 24-48 hours without losing form. Blacklight reactive only; they do NOT glow in the dark. Our balloons are a great compliment with our UV tapes, UV Paints, UV markers and more! Large 11 inch diameter when fully inflated. Not safe for children under 3 years