The SF is like the MF's twin brother that went on the Atkins diet - it looks similar but is thinner at the waistline. Coming in under 8oz, the SF has the same spool diameter as the MF but has a narrower width. Don't let the size fool you! The SF has the stopping power of most 12wts. This saltwater fly reel was created & designed to handle the most variety of saltwater species while still light enough to cast all day long!