R380 (P21/5W) Stop and Tail Bulbs
The R380 (P21/5W) dual filament bulb is most commonly used for vehicle brake and tail lights. Used for both the stop and tail lights, these bulbs require replacing should either of the filaments fail. Ring recommends you always replace R380 bulbs in pairs.
Below are the most popular R380 bulbs from Ring, to see the full range click here.