Only prototypes of Avial Bikes frames are made of the square tube due to its availability. The frames of the production models will be made of a similar square tube, but made to order, with corners rounded to a radius of 3-5 mm (0.12-0.2 inches). Along with this, the upper tube of the frame will be equipped with an additional protective pad that protects the cyclist's body from injury in the event of a fall.