... aluminum tube 3.Bimetal blade, 64HRC hardness Professional Ice Skate Blade 1)Avaliable size: 18",17.5",17",16.5",16",15",14",13 ... .4)Structure:bulit with aricraft grade 7000 structure.5)Blade thickness :1.1mm.6)Bimetal blade.7)Heat Mouldable carbon shell . .We supply ... competitive price on your preferred skate package. Professional Ice Skate Blade ,Short Track Ice Skate (CE standard)