I have 2 1/32nd type 7 u-boats from 32nd parallel ( a type 7C and type 7D ) and have tried at least 6 different types of props on my boats. Over the years I have noticed that 32nd parallel has made at least 2 different styles of props, one style I do not like and the other I do ! . I have tried M.A.C.K. props and did not care for them , but I do use them on my smaller type 21 U-boat. I got a pair of props from a company called SHIPS N\'THINGS,INC. , give AL a call he is a great guy and I think you will be happy with the props that he can sell you. His telephone number is 908 722-0075