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These twin blade 135 mm red plastic propellers with a nose bearing measuring 9.5 mm x 9.5 x 3.2 mm, and comes complete with wire attachment.This is an excellent general purpose propeller with a special nose fitting which enables a pop stick or balsa section to be easily fitted to it . The pop stick may then act as a fuselage to which wings and and a rubber band may be fitted.Also refer to other propeller types: 

Also an excellent propeller to power wind driven land vehicles.

TS0409 three blade with drive shaft: boat propeller.

TS0516 plain propeller without drive mechanism.