Comprop four blade performance composite boat prop. 4x13.6x20 pitch. new in the box. 15 tooth, 4.5" hub. part number M4550. fits mercury and mariner 79 thru: 135 to 300 hp. 91 thru: 150 to 175. mercruiser sterndrives 65 thru: all hp. yamaha O/B and sterndrives 78 thru: 150 to 250 hp. 78-79 175 hp. 90 thru: all hp sterndrives. Asking $50;obo. call or text at 785-577-1645