The Phase 5 Ear Fin is the shortest in length while deeper than the rest of the options. The Ear fin in general offers the most traction out of the Phase Five skim fin offering. The Phase 5 Ear Fin 2.1 is the largest skim style fin with the most grip throughout the entire skim fin lineup. Highly recommended for those who want to massively cut down the learning curve for skim style wake surfing. *Includes ribs and 1.25″ screws