Features: 1. Propeller Is Made Of Modified Material With Advanced Aluminized Nano Carbon Fiber Technology 2. High Toughness And Low Water Absorption 3. Material Type , Suitable For Propeller Specific Materials. 4. Very Low Water Absorption, Carbon Fiber Content, High Strength 5. Requires Personnel For Installation And Maintenance Description: 1. Size:52.5 x 7.1cm 2. Material: Aluminium 3. Propeller Hole Inner Diameter:10mm. 4.Propeller Root Height:13mm 5. Model: 4314 Propeller Blade For X11 Plus Power Pack 6.Color: Black Model: CW Package Contents: 2 x Propeller Blade Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.