This is an APC 24x12E Wide Blade Electric Propeller. FEATURES: Composite construction, Gray in color Thin propeller designed ONLY for Electric use INCLUDES: One APC 22x12E Electric propeller with one each .128" (3.2mm), .158" (4mm), .197" (5mm) .237" (6mm) and .313" (8mm) locating rings for a more precise fit SPECS: Hole diameter: 5/16" Propeller diameter: 22" Propeller pitch 12 Hub Thickness: 1/2" COMMENTS: Do not use with nitro or gasoline powered aircraft. kpm02/07/2007 ir/jxs