This is the first model to use the iconic [1PIN END PIECE] on a metal frame, which is an iconic design features of the first collection released in 2013. The structure of the armor was inspired by an airplane engine that the design team saw when they boarded the plane. The distinctive lens shape with curved hexagonal shape is the ball shape of the 2018SS model [151]. beta titanium temples are designed with dimensions of 0.1mm in consideration of the balance between flexibility and hold feeling, for a comfortable fit.