FCS II Pivot II Longboard Fin Upright fin with minimal sweep and base. Loose fin for performing tighter turns in the pocket. Performance Glass Construction. Pivot in the pocket, lock the rail on the wave face and run the nose. Upright fin with minimal sweep and base. Loose fin for performing tighter turn Add More s. Bigger sizes ideal for logs and nose riding (9" + 10"). 2 + 1 Compatible. Designed to be used in most existing FCS Longboard boxes. No new box required.