FCS 2 Matt Biolos MB Keel Quad Set High area specialty quad set adds bite and control without sacrificing pivot. FIN MATERIAL PERFORMANCE GLASS MORE INFO FIN SIZE Specialized MORE INFO FIN SPECS: SIDE Base: 4.63" / 117.4mmDepth: 4.79" / 121mmArea: 19.27"² / 12432mm²Sweep: 44.8ºFoil: Flat QUAD REAR Base: 4.03" / 102mmDepth: 4.40" / 112mmArea: 12.63"² / 8150mm²Sweep: 28.5ºFoil: 80/20 MORE INFO PERFORMANCE OVERVIEW Matt 'Mayhem' Biolos's specialty quad fin set. High area quad keel set adds bite and control to hybrid boards with wide tails, without sacrificing pivoting capabilities. IDEAL CONDITIONS Open face, down-the-line waves, particularly good in point and reef breaks. BOARD TYPES Modern fish and hybrid models with moderate-to-low rocker. Please Note: this fin is designed to be used exclusively with the FCS II Fin System, and will not fit in the traditional FCS Dual Plug System.