Model: iwatch4 5
Color classification: [black] (5 nails) punk style
                   [Brown] (5 nails) punk style
                   [black] (2 nails) punk style
                   [Brown] (2 nails) punk style
Smart strap size: 38mm (1-3 generation) 42mm (1-3 generation) 40mm (4-5 generation) 44mm (4-5 generation)
Notice:

1:this is only strap for iwatch not include the watch