These RABOESCH high quality propeller shafts have a large range of application. For simple electric boats which are made from ABS, wood, please use 300-00/04. 300-01-03 have strong ABS tubes which makes gluing to your scale model very simple. The other propeller shafts have brass tubes. 300-11 has an extra strong shaft and tube. All the RABOESCH propeller shafts can be shortened very easily. All shafts are made from STAINLESS STEEL.