Hyperion 40-class Curved Gear These are the same as in the Extra 260 40e ARF, made of high tensile spring aluminum. Use as replacements for the Extra 260 40e, or to fit your own models in the 30e to 70e classes. Weight: 63g, Width: 250mm (between axle holes), Height: 135mm (to axle holes), Includes mounting hardware and two aluminum wheel collars as pictured. Hyperion