"Perfect LEDs for electronics tinkering and exploration." We've been selling these cute little packs of LEDs as retail "impulse buy" items for some time, and they're already one of our most popular LED assortments. This pack contains a total of 15 "candle flicker" LEDs in assorted sizes and colors. LED colors are Red, Yellow, and White, and in sizes 3 mm, 5 mm, and 10 mm. Each LED has an internal chip that varies the brightness randomly (when driven with DC voltage), giving the LED a "flickering" look. These are an ideal alternative to candles in decorations and displays.