These are the Lower Rotor Blades for the Heli-Max Axe CX Nano, HMXE13**. FEATURES: Nylon construction INCLUDES: Two Lower Rotor Blades REQUIRES: Installing on rotor assembly SPECS: Length: 3-5/8" (92mm) Width: 53/64" (21.13mm) jpm 2/1/11 ir/jxs