Futures Fins MR Twin +1 Twin Fins Blue-White-BlackThe Mr Twin+ 1 Set Combines The Best Performance Features Of A Twin Fin And A Thruster. Pure Twin Fins Are Fast, Loose, Highly Maneuverable, And Responsive, And The Addition Of A Small Stabilizer Fin Adds An Extra Degree Of Drive And Control. The Large Side Fins From This Set Are Big Enough To Be Ridden In A Pure Twin Fin Configuration And Will Work In Virtually Any Size Or Shape Board In An Optimum Surf Size Range Of 1 To 6 Feet.