This is a 15 x 7 Glass Filled Nylon 3-Blade Propeller from Master Airscrew.
Great scale look.
Constructed from durable 'glass filled nylon.
Greater thrust at lower RPM
High quality sport propellers.
Glass filled nylon for strength & durability.
INCLUDES: One 15 x 7 Glass Filled Nylon 3-Blade Propeller.
Center Hole Bore: 1/4"
The general rule for converting a 2 blade prop to a 3 blade is subtract 1" from diameter OR subtract 1 from the pitch.