CA Greenup Designs Surfboards Quad fin "Mind Machine" one of the staple in the Buttons Pro Series quiver. This is a super fast down the line board with solid hold when it comes to vertical transitions and cutbacks. Design Characteristics: Full outline usually 19 1/4 wide 2 3/8 to 2 1/2 thick depending on length and riders weight etc. Polystyrene resin and polyurethane foam utilizing 4oz. cloth. Epoxy available by request. Low entry rocker blending into speed panel and double concave with double wing swallow incorporated to enhance hydrodynamics of the strategic four fin placement. Flowing into the scallop tail. Custom variations include no wings with standard swallow among others. Board size Range is 5'6" to 6'6" typically Used in Surf 2' to 6' Fin options: Glass on/FCS/FUTURE no extra charge. Sand finish clear as priced. Color pigment add 75.00 per side. Spray airbrush top and bottom starting at 35.00 per side.