Replacement fins for Beater Original Pro. Or use on Stump, 54 Special, JOB Pro, ...Lost RNF or Skipper to convert to twinny. Includes two (2) high performance fins of fiber-filled plastic for perfect mix of stiffness, flex and response. 4" keel fin shape. Catch Surf logos debossed on sides in natural color. Only compatible with Catch Surf's Hi-Performance Fin System.