THIS AD IS FOR 1 CARBON FIBER PROPELLER This propeller fits: Moster 185 2.68, 2.87 Corsair 2.88 Compact Radial/Blackhawk 175 HPR180/225 2.8 Minari 2.8 This prop replaces HELIX H30F 1,25m L-NM-07-2 (7 degrees of pitch) NOTE: THIS PROPELLER DOES NOT REQUIRE THE THICK PROPELLER PLATE USED ON HELIX MOSTER PROPELLERS. WE DESIGNED IT SO YOU DO NOT HAVE TO USE A THICK SPACER AND IT CAN BOLT DIRECTLY ONTO YOUR PULLEY. BOTH 6X60 AND 8X75 BOLTS PATTERNS CAN BE USED. Vortex Aero advanced composite propellers are constructed with the latest in Hybird composite materials. We use precision machined molds to make sure each blade is straight and true everytime. The inner CORE is constructed with composite PARABEAM 3D fabric. Parabeam is a 2 layer composite fabric that is connected with z-directional yarns, which are woven through the top and bottom layers tieing them together a sandwich type structure which gives the material the ability to be super strong and light making it an ideal mateial for propeller construction (see pic above) Read more about it HERE These material are the same composite materials that are use in high quality propellers like HELIX (we learned from the best). The outer layers of the blade are 3K carbon fiber bonded together with premium epoxy resins. All of our blades are weight matched to ensure our props do not crack your pipe....yeah right!! Why choose our propellers?? We have taken the best propellers and made them better and lighter. Lighter propellers give you more thrust and quicker spool up. The Parabeam composite cores make our propeller stronger and more resistant to prop strike damage. The propeller can withstand a few dings and dents without blowing apart like other FOAM CORE PROPS. They are quieter and do not resonate engine noise. And most importantly they will not cost you last weeks paycheck.