CENTURY CNC MACHINED LT SERVO WHEEL, FUTABA MEDIUM This high quality servo wheel increase precise control of your helicopter and adds a vibrant purple accent which follow many Century accessories. Specifications: Total Diameter: 30mm Base thickness: 2.2mm Total Height: 5.1mm Weight: 4g Use: Light Duty Grooved for Futaba servos 2mm tapered holes for better grip Common Application: 30-50 size R/C Helicopters