Specification: Roller skate frame: aluminum, one piece Sheel material: PP Bearings: ABEC7 Shoe: semi-soft with a ventilation system thermoformable breathable membrane velvet material EVA material MESH synthetic leather high-density foam profiled insert Insert length (mm): 220- 240 Wheels: PU90mm/82 A Clasp: Buckle Velcro strap Lacing Remarks: Not for commercial use 24 months warranty