No not really special, but I am building MMBs tug kit and a fellow club member bought a complete one off e-bay and it arrived with plastic props,so I let him try mine they were much better he said if I can keep these on I will pay for another set for you
like a dope I said no problem I dont need them yet. what a mistake to maka Id ask for them back but he is over 6ft and a rugby coach
Jim