In aluminium; each piece in plastic bag complet ewith screw, 2 corns, right and left adds-on, U-bolts; if used with the lenghtener, it keeps the shoe in its position while stretching.
Sizes (shoes with low heel):
1347/1 = n. 2/4
1347/2 = n. 5/6,5
1347/3 = n. 7/11