12.75" Balsa LAMINATED Propeller KIT for Rubber Designed for use with medium rubber powered aircraft (approx 30" wingspan), this propeller kit is very easy to assemble - just glue the numbered parts together and sand the edges smooth. Being made from balsa it is vunerable to knocks and chips, particularly on the leading edge. It will not stand a high speed crash into a hard surface at all well ! Please fly with caution. Please note that this is a kit of laser cut wooden laminations for you to glue and sand to shape.