Fixed-size boot – Provides perfect stability and grip for the foot. Bearings – ABEC-7 Chrome bearings for smooth movement and fluid performance. Wheels – High-quality PU wheels with 85A hardness for high durability and stability. Sizes 36-39: Wheel configuration 74/76/76/74 mm (Width: 24 mm) Sizes 40-45: Wheel configuration 78/80/80/78 mm (Width: 24 mm) Chassis (Frame) – Integrated 4mm thick CNC aluminum frame with Rockered design for greater flexibility and strength. Toe Cap – Hard PP (Polypropylene) front cap for added protection. Outer Shell – Made of hard PP for shock resistance. Cuff – Strong PP ankle cuff for enhanced stability. Inner Liner – Upgraded liner for extra comfort during long use.