Rollerblade - Zetrablade (Black/Yellow) - Men's: For beginner/intermediate skaters wanting comfort, reliability and ease of use. Bio Dynamic Triforce shell. PFS Trainer liner with comfort fit. Closure utilizes quick-sliding laces, buckle and power strap. Composite frame. 76mm/80A Rollerblade wheels. ABEC 5 bearings. Nylon spacers.