DirectGlow Set of 25 Neon Assorted 11 inch Smiley Face Blacklight Reactive Latex Balloons Neon colored in normal light. Incredibly bright under blacklight. 100% latex construction; can be filled with helium if desired 11 inch diameter when fully inflated. Smiley design is 2 sided on each balloons. Blacklight reactive only; they do NOT glow in the dark. 4 great blacklight colors