Tusa SF-15 X-Pert Z-3 Zoom FinsOver 5 years of research and development brought the highly regarded and best selling SF 8 X Pert Zoom split fin to market in 2003. TUSA redefines the fin market again with the introduction of the SF 15 X Pert Zoom Z3. FEATURES Three material design for increased performance compared to standard split fins Patented 27 Angled Blade Design Enhanced propeller fin technology optimizes efficiency Multi compound foot pocket increases power transfer to the