C7 size retrofit replacement bulbs are specially made to be dimmable. They are commercial grade, faceted, LED, screw-in replacement bulbs designed for traditional incandescent C7 (E12) sockets. Each has three super bright LED's encapsulated by a hard-to-break lens (unlike the old-fashioned and very fragile incandescent bulbs). Saves up to 90% on electric use. Recommended for computer animated displays requiring dimming.