This is one 11x4 Zinger Tractor R/C Airplane Wood Propeller by J&Z Products.

FEATURES: It has an airfoil cross section all the way to the top and is test
            proven for high RPM.
          True pitch and has been balanced twice before shipping.
          Single center bore.
          Made of hard rock maple wood.
          Clear coated natural wood finish.
          Classic squared tips.
          Recommended use so that the best performance can be attained:
            Engine Size: .45-.50

INCLUDES: One Zinger Tractor Wood Propeller

SPECS:    Bore Diameter:  1/4"
          Prop Diameter:  11"
          Prop Pitch:     4"

REQUIRES: All propellers must be checked and balanced before using.
          Depending on the engine crankshaft size, the propeller may need to
            be reamed to a larger size using GPMQ5005 (SAE) or
            GPMQ5007 (Metric).
                                                                       kr4/2/02
                                                                         ir/kh