These are commonly known as circular fluorescent light bulbs. Set of 12. Although unused, they have been stored in a warehouse for a long time, so please understand this before purchasing! Daylight color ring light, 20-watt, FCL20D/18-B model. - Brand: HITACHI - Model Name: FCL20D/18-B - Color: Daylight - Shape: Ring Light - Size: 20-watt Thank you for viewing.