This pack includes two Ring BA9S MCC (T4W) 4w 12v Side & Tail Light Bulbs, part number RW233. These bulbs are legal for use in Europe. Ring is a leading supplier of vehicle lighting and auto-electrical products, known for innovation since 1974. The bulbs have a BA9S Bayonet base, a single filament, and measure 8.5 x 26mm. They are a direct replacement manufactured to OEM quality and come with a 1-year warranty.