4.6X2.8 Carbon tow reinforced resin propeller.
KIT TIP: The bolt hole in KT propellers is larger than prop bolt on TeeDees, Norvels, and VAs. A suitable shim can be made by slipping a 3/16" long piece of KT20 latex tubing over the bolt. As a bonus the tubing also helps keep the bolt from coming out of the spinner when you change props.