Inland Surfer Burps Wakesurf Fins 2012: Inland Surfer's Burp 5.5 will help hold you in the wave for tighter tracking, yet allowing the board to break loose for spins. They can be mixed with any other fin in our lineup, giving you a ton of options. These fins are for the Inland Surfer "surf" style boards, NOT for use on any 4-Skim models.