SMC Rubber - Black Professional Fluorine Rubber Strap for Apple Watch

Compatible with all Apple Watch series.

For a 38/40/41mm watch case, the lug width is 20mm.
For a 42/44/45/49mm watch case, the lug width is 22mm.

Specifications:

Material: Fluorine (FKM) rubber
Buckle type: Polished sides, brushed top
Lug width: 20/22
Number of holes: 9
Strap thickness: 3mm
For lug width 20mm, it tapers down to 18mm on buckle side.
For lug width 22mm, it tapers down to 20mm on buckle side.

Measurements:

Short piece length without buckle: 73mm
Long piece length: 123mm