Specification: Inline skates: aluminum Bearings: ABEC7 Shoe: semi-soft with a ventilation system Material: Mesh EVA Synthetic leather High-density foam Wheels: PU64 mm/82A (S 31-34) PU70 mm/82A (M 35-38) PU72 mm/82A (L 39-42) Clasp: Two-section buckle Velcro strap Lacing Inner shoe length: 240-260 mm Brake: Impact resistant PP Remarks: Not for commercial use 24 months warranty