You are buying a 17mm (approx. 20mm shoulder) cut out black plastic/resin Swatch style watch strap. 

This is a replacement to fit Swatch style watches and is not manufactured by Swatch.

Not suitable for Swatch Skin.

Pins included.

Approximate size:

Hole end: 105mm (excluding cut out)

Buckle end: 72mm (excluding buckle and cut out)

This is a regular size strap.

Ref: S1