This set contains a new resin prop and spinner to replace the kit items in the Revell kit. Our resin spinner is more accurate in shape and detail. The misshapen kit blades are replaced with very accurate resin versions which will make a big improvement in the look of your finished model. Easy to install. Can be adapted to fit the Hasegawa and Trumpeter 109G-10 and K-4 kits. (designed to be used with Revell kits)