The Bulbrite 25 Watt A23 Loop Series Bulb is the largest bulb available in the loop series. It features a classic, carefully crafted A-shaped clear glass bulb, a medium screw base and intricate looped filament, which emits a warm amber glow. Other nostalgic bulbs are also available in other wattages, shapes and filament structures (sold separately). Since 1971, from its headquarters in New Jersey, Bulbrite manufactures and supplies an extensive line of innovative and award-winning light bulbs. Their line of energy efficient light source solutions, educational resources and outstanding service make Bulbrite the bulb supplier of choice for lighting professionals.