This propeller is extremely well made and shaped for high performance and thrust throughout the rev range. 

Specifications

Brand                           SUNNYSKY/EOLO
Size                              EOLO 20x9"
MAX Working Speed   ?rpm
Working Speed            ?rpm
Dynamic Balance         ?rpm <?mg
Weight                         ?g
Material                       Wood
Category                      Integrated
Storage Humidity        <85%
Storage Temp              -10deg/c ~ 50deg/c
Working Temp             -20deg/c ~ 60deg/c