Del Sol UV-Patch turns dark purple with to much UVA/UVB exposure, the patch tells you when it's time to apply some more sunscreen. Great for kids or adults, out-door events, beach bums, even winter slopes, and more. Stay protected, DEL SOL UV-Patch is a clinically proven UVA/UVB detection sticker that shows you when to re-apply sunscreen! A pack of 36 UV patches/stickers are ultra thin, 15 mm in diameter. dimensions, ?4.88 x 3.07 x 0.55 inches, 0.35 Ounces, Item Weight, ?0.317 ounces, manufacturer, ?HappyFace World LLC.