These are 2-1/2" tall x 5" long BSA STARFIRE 250 red, purple, & gold die cut vinyl decal stickers for the side cover panels on 1967, 1968, and 1969 BSA B25 and they are sold in pairs. As you can see, BSA designed a visual representation of the moniker, a star on fire. These are die cut vinyl stickers that are easy to apply. 

My name is Tony Schanz, I formerly ran DomiRacer Distributors in Cincinnati, Ohio buying and selling vintage English, Italian, & German motorcycle parts, tools, accessories & memorabilia. DomiRacer closed 6/11/2013, but I still deal in parts, motorbikes, decals, advertising, photos, posters, & more. Please add my store, The Real DomiRacer, to your favorite sellers and watch for other rarities in my future eBay listings.