Eight.3 The Blade 138 Wakesurf Shaper Concave Suction Cup (2018) Introducing: THE BLADE 138 // CONCAVE You have seen or heard of the other suction cup products out there? We offer a performance guaranty that this will exceed anything currently available on the market. Hands down the most performance driven wakesurf shaper out there using a suction cup. Deflecting well over twice the amount of water most of the other guys.