.. These came from a person who had a relative that worked at the old Marx Toy Plant in the 1950-1960's era .. 4 Original Old Marx "Red Soft Plastic" Airplane Propellers .. these were never used and all are in excellent condition; all made in the 1950-1960 era .. I do not know what Airplane these Propellers went on .. each blade or prop is 7/8" long; the center hole is tapered so that it has a smaller hole on the front and a larger hole on the back, so that when it is put on an airplane motor it will lock in place ..  the center hole size is 3/16" and tapers back to 1/8".. I have shown 2 different pictures of the propellers and the 2nd picture shows the propeller with a tape measure so that you can see the size ....   .... I do combine "Most Shipping Charges" when you win 2 or more auctions and I will send you an Invoice with the adjusted shipping charges .. thanks ..