Biela 4 blade scale prop. 22x10 carbon. great for 50-70cc engines and 1/5 scale warbirds. looks great on a 1/5th Mustang or Corsair. My DA-50 had no problem spinning this. Drilled for DA50 and similar bolt patterns, No damage, good condition. These are $110 new from Aircraft International. free shipping in the continental US!!